{"product_id":"stern-defense-9mm-bolt-assembly-mag-phosphate-8620-aisi-steel-for-ar15-m16-004sdbu9d1m","title":"Stern Defense 9mm Bolt Assembly Mag-Phosphate 8620 AISI Steel for AR15\/M16 004SDBU9D1M","description":"\u003ch2\u003eProduct Description\u003c\/h2\u003e\n\u003cp\u003eThe Stern Defense 9mm Bolt Assembly (Model 004SDBU9D1M) is a precision-engineered component purpose-built for AR15\/M16 platforms chambered in 9mm. Constructed from 8620 AISI steel and treated with a durable Mag-Phosphate finish, this bolt is built to handle rigorous use while providing consistent, reliable performance. It fits both Mil-Spec and Glock-pattern upper receivers and is fully compatible with Colt SMG and Glock magazines, giving builders maximum flexibility when assembling a pistol-caliber carbine. Fully assembled right out of the box, the bolt ships with all sub-components pre-installed, including the firing pin, firing pin spring, retaining pin, extractor, extractor spring, and proprietary center and roll pins. The updated bolt design is specifically engineered to work with single-stage triggers featuring short resets, making it a standout choice for competitive shooters and tactical applications alike.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Highlights\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePremium 8620 AISI Steel Construction:\u003c\/strong\u003e Machined from high-quality 8620 AISI steel for exceptional durability and long service life under heavy use.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMag-Phosphate Finish:\u003c\/strong\u003e A corrosion-resistant Mag-Phosphate coating provides reliable protection against wear and environmental exposure.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBroad Compatibility:\u003c\/strong\u003e Fits Mil-Spec and Glock-pattern upper receivers and functions with both Colt SMG and Glock magazines for versatile 9mm carbine builds.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFully Assembled and Ready to Install:\u003c\/strong\u003e Ships complete with all sub-components, including firing pin, spring, retaining pin, extractor, extractor spring, and proprietary center and roll pins.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUpdated Bolt Design for Short Reset Triggers:\u003c\/strong\u003e Incorporates a redesigned bolt profile engineered to accommodate single-stage triggers with short resets, ideal for precision and competitive use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Stern Defense\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMPN:\u003c\/strong\u003e 004SDBU9D1M\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCaliber:\u003c\/strong\u003e 9mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 8620 AISI Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Mag-Phosphate\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFirearm Fit:\u003c\/strong\u003e AR15\/M16\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 15.50 oz\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 860141001522\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eDisclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product's manufacturer.\u003c\/em\u003e\u003c\/p\u003e","brand":"STERN DEFENSE","offers":[{"title":"Default Title","offer_id":44199753351290,"sku":"FLX-174709","price":148.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1679\/0365\/files\/297589889.png?v=1788375278","url":"https:\/\/tlooutdoors.com\/products\/stern-defense-9mm-bolt-assembly-mag-phosphate-8620-aisi-steel-for-ar15-m16-004sdbu9d1m","provider":"TLO Outdoors","version":"1.0","type":"link"}