{"product_id":"stern-defense-sd-bu9-9mm-luger-bolt-mag-phosphate-8620-steel-ar-15-m16","title":"Stern Defense SD BU9 9mm Luger Bolt Mag Phosphate 8620 Steel AR-15\/M16","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 complete \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003e9mm Luger\u003c\/span\u003e\u003c\/strong\u003e bolt assembly engineered for the \u003cstrong\u003eAR-15\/M16\u003c\/strong\u003e platform. Machined from \u003cstrong\u003e8620 AISI steel\u003c\/strong\u003e and protected by a \u003cstrong\u003eMag Phosphate\u003c\/strong\u003e finish, this complete bolt delivers dependable cycling for dedicated 9mm AR builds and pistol-caliber conversions.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe SD BU9 incorporates a \u003cstrong\u003ecustom 4140 billet extractor\u003c\/strong\u003e for superior cartridge extraction and a \u003cstrong\u003eGlock-cut\u003c\/strong\u003e magazine interface, making it directly compatible with both \u003cstrong\u003eColt SMG\u003c\/strong\u003e and \u003cstrong\u003eGlock-pattern\u003c\/strong\u003e 9mm magazines. It is designed to function with \u003cstrong\u003estandard AR-15\/M16 charging handles\u003c\/strong\u003e and installs into both \u003cstrong\u003eMil-Spec\u003c\/strong\u003e and \u003cstrong\u003eGlock-pattern\u003c\/strong\u003e upper receivers, giving builders a versatile component for completing or refreshing a 9mm AR upper.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eCrafted to Stern Defense's standards for AR-15\/M16 components, the SD BU9 brings rugged construction and reliable function to any 9mm blowback or dedicated pistol-caliber AR build.\u003c\/span\u003e\u003c\/p\u003e","brand":"Stern Defense","offers":[{"title":"Default Title","offer_id":55045317984578,"sku":"174709","price":127.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_5e4b7cd4-0d30-4663-98a0-9c2d1f59aca3.png?v=1784696587","url":"https:\/\/centerfiresystems.com\/products\/stern-defense-sd-bu9-9mm-luger-bolt-mag-phosphate-8620-steel-ar-15-m16","provider":"Centerfire Systems","version":"1.0","type":"link"}