--- title: "Sig Sauer M400 Forge 5.56 Rifle With Romeo-MSR" description: "Sig Sauer's M400 Forge is a black 5.56 NATO semi-automatic rifle with a 16\" cold hammer forged barrel, 15\" M-LOK handguard, and ROMEO-MSR Gen II optic." canonical_url: "https://www.kygunco.com/product/sig-sauer-sigm400-5.56-16-forge-blackromeo-msr-gen-ii-30rd" meta: author: KYGUNCO "og:description": "Sig Sauer's M400 Forge is a black 5.56 NATO semi-automatic rifle with a 16\" cold hammer forged barrel, 15\" M-LOK handguard, and ROMEO-MSR Gen II optic." "og:image": "https://cdn.kygunco.com/assets/products/310261/thumbnail.jpg?v=1777037839" "og:image:height": "500" "og:image:width": "500" "og:title": "Sig Sauer M400 Forge 5.56 Rifle With Romeo-MSR" --- > Index of every page on this site: [llms.txt](https://www.kygunco.com/llms.txt) [Home](https://www.kygunco.com/) / [Shooting](https://www.kygunco.com/category/shooting) / [Guns](https://www.kygunco.com/category/shooting/guns) / [Rifles](https://www.kygunco.com/category/shooting/guns/rifles) / [Semi-Auto](https://www.kygunco.com/category/shooting/guns/rifles/semi-auto) / SGS-RM400-556N-16B-FORGE ![Main product image](https://static.kygunco.com/cdn-cgi/image/f=auto,w=600/assets/products/310261/main.jpg?v=1777037839) For illustration purposes only, this image may not be an exact representation of the product. # SIG SAUER SIGM400 Forge 5.56 16" 30rd w/ Romeo-MSR Gen II - Black The SIG M400 Forge is a black 5.56 NATO semi-automatic rifle with a 16" cold hammer forged barrel, mid-length gas system, 15" free-floating M-LOK handguard, and 30rd capacity. It features a TriggerTech two-stage flat trigger, ambidextrous charging handle, Magpul SL-K stock, and factory-installed ROMEO-MSR Gen II red-dot optic with a 2 MOA aiming point. 5.0 ** ** ** ** ** [1 review](#reviews) $999.99 ** 5 interest-free payments of **$200** with ![Sezzle logo](https://www.kygunco.com/brands/sezzle.svg) ** ![Credova logo](https://www.kygunco.com/brands/credova.svg) As low as **$122.51**/month with ![Credova text logo](https://www.kygunco.com/brands/credova-text.svg) ** Online In Store ** Free Shipping Enjoy delivery to the Lower 48 States at no cost. ** Ships To FFL Dealer Handled by our expert shippers in Bardstown, KY. ** Check Local Restrictions Not sure whether this item can be shipped to your area? Enter your ZIP code for a quick check. Item # 310261 Style RM400-556N-16B-FORGE UPC 798681744114 Condition New Manufacturer [Sig Sauer](https://www.kygunco.com/brand/sig-sauer) Model SIGM400 Round Capacity 30 Caliber 5.56 NATO Action Semi-Auto Barrel Length 16 in The SIG M400 Forge is a full-length, duty-ready rifle built to deliver reliability, balance, and modern performance straight from the factory. Designed around a mid-length gas system and premium internal components, it offers smooth recoil impulse and consistent accuracy for extended shooting sessions. With a lightweight, ergonomic configuration and factory-installed optic, the M400 Forge is optimized for shooters seeking a versatile, ready-to-run 5.56 platform. FEATURES - TriggerTech two-stage flat blade duty trigger - Mid-length gas system for improved recoil management - Ambidextrous charging handle - 15" free-floating M-LOK handguard - Full-length Picatinny top rail - Six-position MAGPUL SL-K stock - Factory-installed ROMEO-MSR Gen II red-dot optic with 2 MOA aiming point SPECIFICATIONS - Caliber: 5.56 NATO - Action: Semi-automatic - Operating System: Gas - Capacity: 30+1 - Barrel Length: 16" - Barrel Material: Cold hammer forged steel - Barrel Finish: Black - Twist Rate: 1:7" - Receiver Material: Alloy - Receiver Finish: Black anodized - Receiver Description: Picatinny rail - Handguards: M-LOK - Grips: Black polymer - Trigger: TriggerTech two-stage - Trigger Pull Weight: 3.5 lbs - Stock Material: Polymer - Stock Finish Group: Black - Stock Description: Magpul SL-K - Overall Length: 32.25"–35.50" - Height: 7.20" - Width: 2.70" - Weight: 6.80 lbs ** WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to [www.p65warnings.ca.gov](https://www.p65warnings.ca.gov). 5.0 ** ** ** ** ** 1 review ** ** ** ** ** 1 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ## Reviews ** Paul Whitehouse, TX Solid AR Style rifle. Have not fired it yet but tore it down for cleaning and was impressed with the build quality. Kygunco is the best place for online purchases. Great prices, fast shipping, and no CC fees. Love doing business with these folks. 5 months ago ** ** ** ** ** ## Don't Forget Your Ammo ```json {"@context":"https://schema.org","@graph":[{"@id":"https://www.kygunco.com/#website","@type":"WebSite","description":"Shop KYGUNCO for firearms, ammo, accessories, parts, and outdoor gear at low prices with fast, easy nationwide shipping.","name":"KYGUNCO","url":"https://www.kygunco.com/","publisher":{"@id":"https://www.kygunco.com/#/schema/organization/kygunco"}},{"@id":"https://www.kygunco.com/product/sig-sauer-sigm400-5.56-16-forge-blackromeo-msr-gen-ii-30rd#webpage","@type":"WebPage","description":"Sig Sauer's M400 Forge is a black 5.56 NATO semi-automatic rifle with a 16\" cold hammer forged barrel, 15\" M-LOK handguard, and ROMEO-MSR Gen II optic.","name":"Sig Sauer M400 Forge 5.56 Rifle With 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Have not fired it yet but tore it down for cleaning and was impressed with the build quality. Kygunco is the best place for online purchases. Great prices, fast shipping, and no CC fees. Love doing business with these folks.","reviewRating":{"@type":"Rating","bestRating":5,"worstRating":1,"ratingValue":5},"datePublished":"2026-06-24T15:03:41.7136394+00:00","author":{"@type":"Person","name":"Paul"},"inLanguage":"en"}},{"@id":"https://www.kygunco.com/product/sig-sauer-sigm400-5.56-16-forge-blackromeo-msr-gen-ii-30rd#breadcrumb","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","name":"Home","item":"https://www.kygunco.com","position":1},{"@type":"ListItem","name":"Shooting","item":"https://www.kygunco.com/category/shooting","position":2},{"@type":"ListItem","name":"Guns","item":"https://www.kygunco.com/category/shooting/guns","position":3},{"@type":"ListItem","name":"Rifles","item":"https://www.kygunco.com/category/shooting/guns/rifles","position":4},{"@type":"ListItem","name":"Semi-Auto","item":"https://www.kygunco.com/category/shooting/guns/rifles/semi-auto","position":5},{"@type":"ListItem","name":"SGS-RM400-556N-16B-FORGE","position":6}]},{"@id":"https://www.kygunco.com/#/schema/image/1","@type":"ImageObject","contentUrl":"https://cdn.kygunco.com/assets/backdrops/facade.jpg","inLanguage":"en","url":"https://cdn.kygunco.com/assets/backdrops/facade.jpg"}]} ``` ## Sitemap See the full [sitemap](https://www.kygunco.com/sitemap.md) for all pages.