{"id":63,"date":"2022-07-13T21:29:56","date_gmt":"2022-07-13T21:29:56","guid":{"rendered":"http:\/\/armsjournal.net:8080\/?p=63"},"modified":"2025-12-15T23:36:58","modified_gmt":"2025-12-15T23:36:58","slug":"sig-stgw-90-sg-550","status":"publish","type":"post","link":"https:\/\/armsjournal.net\/?p=63","title":{"rendered":"The Sig SG 550 STGW 90 military and instructor issue rifle explained"},"content":{"rendered":"\n<p>The Swiss designation STGW 90, is the non-export version of the SIG SG 550 issued to military personal and instructors of the Swiss Confederation. It was produced in Switzerland by SIG Combibloc Services AG.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"259\" src=\"http:\/\/armsjournal.net:8080\/wp-content\/uploads\/2022\/07\/ED101662-FBE1-4AB6-85EF-629E0A76EB46-1024x259.jpeg\" alt=\"\" class=\"wp-image-139\" srcset=\"https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/ED101662-FBE1-4AB6-85EF-629E0A76EB46-1024x259.jpeg 1024w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/ED101662-FBE1-4AB6-85EF-629E0A76EB46-300x76.jpeg 300w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/ED101662-FBE1-4AB6-85EF-629E0A76EB46-768x194.jpeg 768w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/ED101662-FBE1-4AB6-85EF-629E0A76EB46-1536x388.jpeg 1536w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/ED101662-FBE1-4AB6-85EF-629E0A76EB46-2048x517.jpeg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/armsjournal.net:8080\/wp-content\/uploads\/2022\/07\/35AFDFDC-2E34-46C9-939B-EF35232F683F-1024x310.jpeg\" alt=\"\" class=\"wp-image-140\" width=\"649\" height=\"196\" srcset=\"https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/35AFDFDC-2E34-46C9-939B-EF35232F683F-1024x310.jpeg 1024w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/35AFDFDC-2E34-46C9-939B-EF35232F683F-300x91.jpeg 300w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/35AFDFDC-2E34-46C9-939B-EF35232F683F-768x232.jpeg 768w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/35AFDFDC-2E34-46C9-939B-EF35232F683F-1536x464.jpeg 1536w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/35AFDFDC-2E34-46C9-939B-EF35232F683F-2048x619.jpeg 2048w\" sizes=\"auto, (max-width: 649px) 100vw, 649px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/armsjournal.net:8080\/wp-content\/uploads\/2022\/07\/68DD246B-A722-48C4-9DE9-587CC760FF40-1024x435.jpeg\" alt=\"\" class=\"wp-image-141\" width=\"647\" height=\"274\" srcset=\"https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/68DD246B-A722-48C4-9DE9-587CC760FF40-1024x435.jpeg 1024w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/68DD246B-A722-48C4-9DE9-587CC760FF40-300x128.jpeg 300w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/68DD246B-A722-48C4-9DE9-587CC760FF40-768x326.jpeg 768w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/68DD246B-A722-48C4-9DE9-587CC760FF40-1536x653.jpeg 1536w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/68DD246B-A722-48C4-9DE9-587CC760FF40-2048x871.jpeg 2048w\" sizes=\"auto, (max-width: 647px) 100vw, 647px\" \/><\/figure>\n\n\n\n<p>The STGW 90 is the replacement to the STGW 57, its philosophy is rather different than its predecessor. While the STGW 57 was a one-configuration-all-roles full power rifle, the STGW 90 is a modular intermediate rifle.<\/p>\n\n\n\n<p>The STGW 90 uses a long stroke gas system and bolt similar to the Kalashnikov. The gas system has the 2 modes, normal mode and dirty\/cold mode. It has a Kalashnikov style magazine release and is extremely straightforward to disassemble.<\/p>\n\n\n\n<p>The STGW 90 has a &#8220;Kalashnikov style&#8221; right side charging handle and a bolt catch release on the left side (like an Armalite). This gives the operator a choice, the bolt can be dropped either by pressing the release on the left or by pulling the charging handle on the right.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"http:\/\/armsjournal.net:8080\/wp-content\/uploads\/2022\/07\/image-6-1024x576.jpeg\" alt=\"\" class=\"wp-image-196\" srcset=\"https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-6-1024x576.jpeg 1024w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-6-300x169.jpeg 300w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-6-768x432.jpeg 768w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-6-1536x864.jpeg 1536w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-6.jpeg 1940w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>The selector has semi automatic, tri burst, and fully automatic burst modes. The full auto mode is marked as 20 since Swiss military doctrine mandates 20 round magazines (useful prone shooting). A true non-export SG 550 SGTW 90 selector has a latch to prevent the burst modes from being selected. The white circle is used to indicate that a Swiss military rifle cannot be switched to burst mode, that it is safe to be used for marksmanship qualification.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"http:\/\/armsjournal.net:8080\/wp-content\/uploads\/2022\/07\/05CFCBDA-531B-4E90-B28B-83217CCE0714-1024x576.jpeg\" alt=\"\" class=\"wp-image-142\" srcset=\"https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/05CFCBDA-531B-4E90-B28B-83217CCE0714-1024x576.jpeg 1024w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/05CFCBDA-531B-4E90-B28B-83217CCE0714-300x169.jpeg 300w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/05CFCBDA-531B-4E90-B28B-83217CCE0714-768x432.jpeg 768w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/05CFCBDA-531B-4E90-B28B-83217CCE0714-1536x864.jpeg 1536w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/05CFCBDA-531B-4E90-B28B-83217CCE0714-2048x1152.jpeg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"http:\/\/armsjournal.net:8080\/wp-content\/uploads\/2022\/07\/A534B2D3-E70A-45F0-823F-2E922837CEBC-1024x576.jpeg\" alt=\"\" class=\"wp-image-144\" srcset=\"https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/A534B2D3-E70A-45F0-823F-2E922837CEBC-1024x576.jpeg 1024w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/A534B2D3-E70A-45F0-823F-2E922837CEBC-300x169.jpeg 300w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/A534B2D3-E70A-45F0-823F-2E922837CEBC-768x432.jpeg 768w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/A534B2D3-E70A-45F0-823F-2E922837CEBC-1536x864.jpeg 1536w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/A534B2D3-E70A-45F0-823F-2E922837CEBC-2048x1152.jpeg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Swiss gun culture is quite different than American gun culture, one major difference is that military service is compulsory. Significantly many more Swiss serve in reserve than Americans. That being said, almost all Swiss train in marksmanship at some point in their life. Swiss shooting societies, such as the Swiss Shooting Sport Federation (Schweizer Schiesssportverband) play a role in the design choices of their country&#8217;s service rifle. This is reflected in the \u201dfull length\u201d barrel and the sight types.<\/p>\n\n\n\n<p><strong>Sights<\/strong> <\/p>\n\n\n\n<p>The rear diopter drum has 4 selections:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/armsjournal.net:8080\/wp-content\/uploads\/2022\/07\/image-3-1024x1024.jpeg\" alt=\"\" class=\"wp-image-187\" width=\"506\" height=\"506\" srcset=\"https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-3-1024x1024.jpeg 1024w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-3-300x300.jpeg 300w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-3-150x150.jpeg 150w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-3-768x768.jpeg 768w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-3-1536x1536.jpeg 1536w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-3.jpeg 2040w\" sizes=\"auto, (max-width: 506px) 100vw, 506px\" \/><figcaption>100 meters rear notch and night rear sight.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/armsjournal.net:8080\/wp-content\/uploads\/2022\/07\/F1EED6D8-9429-4061-91AA-57AE75FD9AD1-1024x1024.jpeg\" alt=\"\" class=\"wp-image-189\" width=\"516\" height=\"516\" srcset=\"https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/F1EED6D8-9429-4061-91AA-57AE75FD9AD1-1024x1024.jpeg 1024w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/F1EED6D8-9429-4061-91AA-57AE75FD9AD1-300x300.jpeg 300w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/F1EED6D8-9429-4061-91AA-57AE75FD9AD1-150x150.jpeg 150w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/F1EED6D8-9429-4061-91AA-57AE75FD9AD1-768x768.jpeg 768w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/F1EED6D8-9429-4061-91AA-57AE75FD9AD1-1536x1536.jpeg 1536w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/F1EED6D8-9429-4061-91AA-57AE75FD9AD1.jpeg 1636w\" sizes=\"auto, (max-width: 516px) 100vw, 516px\" \/><figcaption>200 meter diopter aperture.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/armsjournal.net:8080\/wp-content\/uploads\/2022\/07\/image-4-1024x1024.jpeg\" alt=\"\" class=\"wp-image-190\" width=\"518\" height=\"518\" srcset=\"https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-4-1024x1024.jpeg 1024w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-4-300x300.jpeg 300w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-4-150x150.jpeg 150w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-4-768x768.jpeg 768w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-4-1536x1536.jpeg 1536w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-4.jpeg 1669w\" sizes=\"auto, (max-width: 518px) 100vw, 518px\" \/><figcaption>300 meter diopter aperture.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/armsjournal.net:8080\/wp-content\/uploads\/2022\/07\/image-5-1024x1024.jpeg\" alt=\"\" class=\"wp-image-192\" width=\"515\" height=\"515\" srcset=\"https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-5-1024x1024.jpeg 1024w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-5-300x300.jpeg 300w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-5-150x150.jpeg 150w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-5-768x768.jpeg 768w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-5.jpeg 1518w\" sizes=\"auto, (max-width: 515px) 100vw, 515px\" \/><figcaption>Close range rear sight without insert, 300 meter target discipline sight with insert.<\/figcaption><\/figure>\n\n\n\n<p>The front sight has a simple non-adjustable post with a flip up night glow post for use with rear sight number 1s glow dots. The front sight is protected by a ring, the ring is also used to aim. To aim, match the front ring to the middle of the rear diopter.<\/p>\n\n\n\n<p><strong>Cartridge<\/strong><\/p>\n\n\n\n<p>The STGW 90 has a 5,56 NATO spec chamber, but neutral Switzerland is not a NATO member. Their cartridge is the 5,6mm GP 90, GP 90 standing for Gewehrpatrone 1990 (not at all the same as the 1890 GP90 Schmidt-Rubin cartridge). This cartridge, manufactured by Ruag Ammotech, uses a 63 grain full metal jacket projectile tailored for the STGW 90s \u22481:10 inch twist rate barrel.<\/p>\n\n\n\n<p><strong>Furniture<\/strong><\/p>\n\n\n\n<p>The handguard comes with a built in non adjustable bipod. The pistol grip is proprietary, the stock is non adjustable. The advantage of a non adjustable stock is that every Swiss soldier is trained to immedicably be able to shoot any STGW 90 they acquire without worrying about adjustment. Some special soldiers are issued 2 position stocks that adjust to increase the length of pull. Shorter versions of the SG 550 are issued to some special soldiers, some of these have no bipod in the handguard. <br><br><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"998\" height=\"1024\" src=\"http:\/\/armsjournal.net:8080\/wp-content\/uploads\/2022\/07\/image-2-998x1024.jpeg\" alt=\"\" class=\"wp-image-186\" srcset=\"https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-2-998x1024.jpeg 998w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-2-292x300.jpeg 292w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-2-768x788.jpeg 768w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-2-1496x1536.jpeg 1496w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/image-2-1995x2048.jpeg 1995w\" sizes=\"auto, (max-width: 998px) 100vw, 998px\" \/><figcaption>Standard issue stock (top) and adjustable stock (bottom)<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"http:\/\/armsjournal.net:8080\/wp-content\/uploads\/2022\/07\/231DD182-F057-46EC-965A-DDE70C26C12D-1024x576.jpeg\" alt=\"\" class=\"wp-image-179\" srcset=\"https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/231DD182-F057-46EC-965A-DDE70C26C12D-1024x576.jpeg 1024w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/231DD182-F057-46EC-965A-DDE70C26C12D-300x169.jpeg 300w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/231DD182-F057-46EC-965A-DDE70C26C12D-768x432.jpeg 768w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/231DD182-F057-46EC-965A-DDE70C26C12D-1536x864.jpeg 1536w, https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/231DD182-F057-46EC-965A-DDE70C26C12D-2048x1152.jpeg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Shorted barrel versions (in semi automatic), with shortened gas system and handguard. Rifles similar to these could be issues to special soldiers.<\/figcaption><\/figure>\n\n\n\n<p><strong>Issuing the STGW 90<\/strong><\/p>\n\n\n\n<p>Swiss active duty and reserve soldiers train with and are issued this the STGW 90. The other way to be issues this rifle is to be federally recognized as an instructor. The rifle is issued to instructions in 5 year increments from the central government to residents of any canton who meet the requirements. STGW 90 rifles remain Swiss government property at all times.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Swiss designation STGW 90, is the non-export version of the SIG SG 550 issued to military personal and instructors of the Swiss Confederation. It was produced in Switzerland by SIG Combibloc Services AG. The STGW 90 is the replacement to the STGW 57, its philosophy is rather different than its predecessor. While the STGW [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":139,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[10,13,12,11,14,6],"class_list":["post-63","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-5-56-nato","tag-assault-rifles","tag-infantry-rifles","tag-military-rifles","tag-sig","tag-swiss"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The Sig SG 550 STGW 90 military and instructor issue rifle explained - ArmsJournal.net<\/title>\n<meta name=\"description\" content=\"Dive into the Sig SG 550 STGW 90 rifle, Switzerland&#039;s non-export military and instructor-issued assault rifle replacing the STGW 57 with a modular intermediate design. Discover its long stroke gas system, Kalashnikov-inspired features, selector modes including burst limitations, diopter sights, built-in bipod, and historical ties to Swiss compulsory service, reserve training, and marksmanship culture.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/armsjournal.net\/?p=63\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The Sig SG 550 STGW 90 military and instructor issue rifle explained - ArmsJournal.net\" \/>\n<meta property=\"og:description\" content=\"Dive into the Sig SG 550 STGW 90 rifle, Switzerland&#039;s non-export military and instructor-issued assault rifle replacing the STGW 57 with a modular intermediate design. Discover its long stroke gas system, Kalashnikov-inspired features, selector modes including burst limitations, diopter sights, built-in bipod, and historical ties to Swiss compulsory service, reserve training, and marksmanship culture.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/armsjournal.net\/?p=63\" \/>\n<meta property=\"og:site_name\" content=\"ArmsJournal.net\" \/>\n<meta property=\"article:published_time\" content=\"2022-07-13T21:29:56+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-15T23:36:58+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/ED101662-FBE1-4AB6-85EF-629E0A76EB46-scaled.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"647\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Raymond C\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Raymond C\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/armsjournal.net\\\/?p=63#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/armsjournal.net\\\/?p=63\"},\"author\":{\"name\":\"Raymond C\",\"@id\":\"https:\\\/\\\/armsjournal.net\\\/#\\\/schema\\\/person\\\/7ffdd764afaa82cd7488870888c949e3\"},\"headline\":\"The Sig SG 550 STGW 90 military and instructor issue rifle explained\",\"datePublished\":\"2022-07-13T21:29:56+00:00\",\"dateModified\":\"2025-12-15T23:36:58+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/armsjournal.net\\\/?p=63\"},\"wordCount\":637,\"publisher\":{\"@id\":\"https:\\\/\\\/armsjournal.net\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/armsjournal.net\\\/?p=63#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/armsjournal.net\\\/wp-content\\\/uploads\\\/2022\\\/07\\\/ED101662-FBE1-4AB6-85EF-629E0A76EB46-scaled.jpeg\",\"keywords\":[\"5.56 NATO\",\"assault rifles\",\"infantry rifles\",\"military rifles\",\"Sig\",\"Swiss\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/armsjournal.net\\\/?p=63\",\"url\":\"https:\\\/\\\/armsjournal.net\\\/?p=63\",\"name\":\"The Sig SG 550 STGW 90 military and instructor issue rifle explained - ArmsJournal.net\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/armsjournal.net\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/armsjournal.net\\\/?p=63#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/armsjournal.net\\\/?p=63#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/armsjournal.net\\\/wp-content\\\/uploads\\\/2022\\\/07\\\/ED101662-FBE1-4AB6-85EF-629E0A76EB46-scaled.jpeg\",\"datePublished\":\"2022-07-13T21:29:56+00:00\",\"dateModified\":\"2025-12-15T23:36:58+00:00\",\"description\":\"Dive into the Sig SG 550 STGW 90 rifle, Switzerland's non-export military and instructor-issued assault rifle replacing the STGW 57 with a modular intermediate design. Discover its long stroke gas system, Kalashnikov-inspired features, selector modes including burst limitations, diopter sights, built-in bipod, and historical ties to Swiss compulsory service, reserve training, and marksmanship culture.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/armsjournal.net\\\/?p=63#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/armsjournal.net\\\/?p=63\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/armsjournal.net\\\/?p=63#primaryimage\",\"url\":\"https:\\\/\\\/armsjournal.net\\\/wp-content\\\/uploads\\\/2022\\\/07\\\/ED101662-FBE1-4AB6-85EF-629E0A76EB46-scaled.jpeg\",\"contentUrl\":\"https:\\\/\\\/armsjournal.net\\\/wp-content\\\/uploads\\\/2022\\\/07\\\/ED101662-FBE1-4AB6-85EF-629E0A76EB46-scaled.jpeg\",\"width\":2560,\"height\":647},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/armsjournal.net\\\/?p=63#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/armsjournal.net\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"The Sig SG 550 STGW 90 military and instructor issue rifle explained\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/armsjournal.net\\\/#website\",\"url\":\"https:\\\/\\\/armsjournal.net\\\/\",\"name\":\"ArmsJournal.net\",\"description\":\"Firearm blog\",\"publisher\":{\"@id\":\"https:\\\/\\\/armsjournal.net\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/armsjournal.net\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/armsjournal.net\\\/#organization\",\"name\":\"armsjournal\",\"url\":\"https:\\\/\\\/armsjournal.net\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/armsjournal.net\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"http:\\\/\\\/armsjournal.net\\\/wp-content\\\/uploads\\\/2022\\\/07\\\/16E9385F-065C-4AA1-9768-B67EA5B52589.jpeg\",\"contentUrl\":\"http:\\\/\\\/armsjournal.net\\\/wp-content\\\/uploads\\\/2022\\\/07\\\/16E9385F-065C-4AA1-9768-B67EA5B52589.jpeg\",\"width\":2048,\"height\":2048,\"caption\":\"armsjournal\"},\"image\":{\"@id\":\"https:\\\/\\\/armsjournal.net\\\/#\\\/schema\\\/logo\\\/image\\\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/armsjournal.net\\\/#\\\/schema\\\/person\\\/7ffdd764afaa82cd7488870888c949e3\",\"name\":\"Raymond C\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/413a8bc2da9c20dbf39caedab298bdcfdf9dcb4f1caebc4f80ebc62081e71040?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/413a8bc2da9c20dbf39caedab298bdcfdf9dcb4f1caebc4f80ebc62081e71040?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/413a8bc2da9c20dbf39caedab298bdcfdf9dcb4f1caebc4f80ebc62081e71040?s=96&d=mm&r=g\",\"caption\":\"Raymond C\"},\"description\":\"Just a dedicated enthusiast. Do what you love and you will never work a day in your life.\",\"url\":\"https:\\\/\\\/armsjournal.net\\\/?author=3\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"The Sig SG 550 STGW 90 military and instructor issue rifle explained - ArmsJournal.net","description":"Dive into the Sig SG 550 STGW 90 rifle, Switzerland's non-export military and instructor-issued assault rifle replacing the STGW 57 with a modular intermediate design. Discover its long stroke gas system, Kalashnikov-inspired features, selector modes including burst limitations, diopter sights, built-in bipod, and historical ties to Swiss compulsory service, reserve training, and marksmanship culture.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/armsjournal.net\/?p=63","og_locale":"en_US","og_type":"article","og_title":"The Sig SG 550 STGW 90 military and instructor issue rifle explained - ArmsJournal.net","og_description":"Dive into the Sig SG 550 STGW 90 rifle, Switzerland's non-export military and instructor-issued assault rifle replacing the STGW 57 with a modular intermediate design. Discover its long stroke gas system, Kalashnikov-inspired features, selector modes including burst limitations, diopter sights, built-in bipod, and historical ties to Swiss compulsory service, reserve training, and marksmanship culture.","og_url":"https:\/\/armsjournal.net\/?p=63","og_site_name":"ArmsJournal.net","article_published_time":"2022-07-13T21:29:56+00:00","article_modified_time":"2025-12-15T23:36:58+00:00","og_image":[{"width":2560,"height":647,"url":"https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/ED101662-FBE1-4AB6-85EF-629E0A76EB46-scaled.jpeg","type":"image\/jpeg"}],"author":"Raymond C","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Raymond C","Est. reading time":"6 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/armsjournal.net\/?p=63#article","isPartOf":{"@id":"https:\/\/armsjournal.net\/?p=63"},"author":{"name":"Raymond C","@id":"https:\/\/armsjournal.net\/#\/schema\/person\/7ffdd764afaa82cd7488870888c949e3"},"headline":"The Sig SG 550 STGW 90 military and instructor issue rifle explained","datePublished":"2022-07-13T21:29:56+00:00","dateModified":"2025-12-15T23:36:58+00:00","mainEntityOfPage":{"@id":"https:\/\/armsjournal.net\/?p=63"},"wordCount":637,"publisher":{"@id":"https:\/\/armsjournal.net\/#organization"},"image":{"@id":"https:\/\/armsjournal.net\/?p=63#primaryimage"},"thumbnailUrl":"https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/ED101662-FBE1-4AB6-85EF-629E0A76EB46-scaled.jpeg","keywords":["5.56 NATO","assault rifles","infantry rifles","military rifles","Sig","Swiss"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/armsjournal.net\/?p=63","url":"https:\/\/armsjournal.net\/?p=63","name":"The Sig SG 550 STGW 90 military and instructor issue rifle explained - ArmsJournal.net","isPartOf":{"@id":"https:\/\/armsjournal.net\/#website"},"primaryImageOfPage":{"@id":"https:\/\/armsjournal.net\/?p=63#primaryimage"},"image":{"@id":"https:\/\/armsjournal.net\/?p=63#primaryimage"},"thumbnailUrl":"https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/ED101662-FBE1-4AB6-85EF-629E0A76EB46-scaled.jpeg","datePublished":"2022-07-13T21:29:56+00:00","dateModified":"2025-12-15T23:36:58+00:00","description":"Dive into the Sig SG 550 STGW 90 rifle, Switzerland's non-export military and instructor-issued assault rifle replacing the STGW 57 with a modular intermediate design. Discover its long stroke gas system, Kalashnikov-inspired features, selector modes including burst limitations, diopter sights, built-in bipod, and historical ties to Swiss compulsory service, reserve training, and marksmanship culture.","breadcrumb":{"@id":"https:\/\/armsjournal.net\/?p=63#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/armsjournal.net\/?p=63"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/armsjournal.net\/?p=63#primaryimage","url":"https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/ED101662-FBE1-4AB6-85EF-629E0A76EB46-scaled.jpeg","contentUrl":"https:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/ED101662-FBE1-4AB6-85EF-629E0A76EB46-scaled.jpeg","width":2560,"height":647},{"@type":"BreadcrumbList","@id":"https:\/\/armsjournal.net\/?p=63#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/armsjournal.net\/"},{"@type":"ListItem","position":2,"name":"The Sig SG 550 STGW 90 military and instructor issue rifle explained"}]},{"@type":"WebSite","@id":"https:\/\/armsjournal.net\/#website","url":"https:\/\/armsjournal.net\/","name":"ArmsJournal.net","description":"Firearm blog","publisher":{"@id":"https:\/\/armsjournal.net\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/armsjournal.net\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/armsjournal.net\/#organization","name":"armsjournal","url":"https:\/\/armsjournal.net\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/armsjournal.net\/#\/schema\/logo\/image\/","url":"http:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/16E9385F-065C-4AA1-9768-B67EA5B52589.jpeg","contentUrl":"http:\/\/armsjournal.net\/wp-content\/uploads\/2022\/07\/16E9385F-065C-4AA1-9768-B67EA5B52589.jpeg","width":2048,"height":2048,"caption":"armsjournal"},"image":{"@id":"https:\/\/armsjournal.net\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/armsjournal.net\/#\/schema\/person\/7ffdd764afaa82cd7488870888c949e3","name":"Raymond C","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/413a8bc2da9c20dbf39caedab298bdcfdf9dcb4f1caebc4f80ebc62081e71040?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/413a8bc2da9c20dbf39caedab298bdcfdf9dcb4f1caebc4f80ebc62081e71040?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/413a8bc2da9c20dbf39caedab298bdcfdf9dcb4f1caebc4f80ebc62081e71040?s=96&d=mm&r=g","caption":"Raymond C"},"description":"Just a dedicated enthusiast. Do what you love and you will never work a day in your life.","url":"https:\/\/armsjournal.net\/?author=3"}]}},"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/armsjournal.net\/index.php?rest_route=\/wp\/v2\/posts\/63","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/armsjournal.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/armsjournal.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/armsjournal.net\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/armsjournal.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=63"}],"version-history":[{"count":47,"href":"https:\/\/armsjournal.net\/index.php?rest_route=\/wp\/v2\/posts\/63\/revisions"}],"predecessor-version":[{"id":904,"href":"https:\/\/armsjournal.net\/index.php?rest_route=\/wp\/v2\/posts\/63\/revisions\/904"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/armsjournal.net\/index.php?rest_route=\/wp\/v2\/media\/139"}],"wp:attachment":[{"href":"https:\/\/armsjournal.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=63"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/armsjournal.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=63"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/armsjournal.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=63"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}