{"product_id":"stern-defense-sd-bu9-9mm-ar-15-bolt-8620-steel-nib-mag-phosphate-hybrid","title":"Stern Defense SD-BU9 9mm AR-15 Bolt - 8620 Steel NIB\/Mag Phosphate Hybrid","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eStern Defense SD-BU9\u003c\/span\u003e\u003c\/strong\u003e is a dedicated \u003cstrong\u003e9mm\u003c\/strong\u003e bolt purpose-built for \u003cstrong\u003eAR-15\u003c\/strong\u003e and \u003cstrong\u003eM16\u003c\/strong\u003e pistol caliber carbine platforms. It is machined from \u003cstrong\u003e8620 AISI steel\u003c\/strong\u003e and finished with a hybrid \u003cstrong\u003eNIB (Nickel Boron) \/ Mag Phosphate\u003c\/strong\u003e coating, providing the hardness, corrosion resistance, and lubricity needed to handle the fouling and high cycle rates of a 9mm blowback AR setup.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe SD-BU9 drops into standard \u003cstrong\u003eMil-Spec\u003c\/strong\u003e upper receivers and is also compatible with \u003cstrong\u003eGlock-pattern\u003c\/strong\u003e upper receivers, supporting both Colt SMG and Glock magazine-compatible 9mm AR builds. It functions with \u003cstrong\u003eColt SMG\u003c\/strong\u003e and \u003cstrong\u003eGlock-pattern magazines\u003c\/strong\u003e, and it is fully compatible with standard \u003cstrong\u003eAR-15\/M16 charging handles\u003c\/strong\u003e so no specialty parts are required for installation.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eWhether you are finishing out a new 9mm AR pistol or rifle build, replacing a worn PCC bolt, or refreshing a dedicated sub-gun upper, the \u003cstrong\u003eStern Defense SD-BU9\u003c\/strong\u003e delivers a properly finished, high-strength bolt solution for your platform.\u003c\/span\u003e\u003c\/p\u003e","brand":"Stern Defense","offers":[{"title":"Default Title","offer_id":55045280891202,"sku":"174710","price":167.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_57a230f2-7272-4b58-af40-1d03ddecb344.png?v=1784696420","url":"https:\/\/centerfiresystems.com\/products\/stern-defense-sd-bu9-9mm-ar-15-bolt-8620-steel-nib-mag-phosphate-hybrid","provider":"Centerfire Systems","version":"1.0","type":"link"}