{"product_id":"cmmg-replacement-barrel-and-bcg-kit-9mm-luger-8-inch-black-nitride-chrome-moly-steel-99d517a","title":"CMMG Replacement Barrel and BCG Kit 9mm Luger 8-Inch Black Nitride Chrome Moly Steel 99D517A","description":"Product Description\n\u003cp\u003eThe CMMG 99D517A Replacement Barrel and Bolt Carrier Group Kit is engineered for shooters looking to build a high-performance Pistol Caliber Carbine (PCC) chambered in 9mm Luger. Featuring CMMG's Patent Pending Radial Delayed Blowback (RDB) system, this kit delivers a superior shooting experience compared to conventional direct blowback designs. The RDB system forces the bolt to rotate and unlock before cycling, effectively slowing the bolt carrier group. This innovative mechanism allows for a lighter BCG overall and noticeably reduces felt recoil versus straight blowback systems. The 8-inch Chrome Moly Steel barrel is treated with a Salt Bath Nitride (Black Nitride) finish for outstanding corrosion resistance and long-term durability. The kit is designed to work exclusively with mil-spec AR-15 upper receivers that feature a modified ejection port, such as CMMG's MkG and MkGs uppers, and is compatible with most mil-spec AR-15 lowers when paired with 9mm AR Conversion magazines, as well as CMMG's MkGs, Mk17, and Mk9 lowers. Note: Older Mk9 lowers will require a CMMG retrofit kit to convert to Radial Delayed Blowback compatibility.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Highlights\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePatent Pending Radial Delayed Blowback (RDB) System\u003c\/strong\u003e - Forces the bolt to rotate and unlock before cycling, reducing bolt velocity and felt recoil compared to traditional straight blowback designs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e8-Inch Chrome Moly Steel Barrel\u003c\/strong\u003e - Precision-crafted from durable Chrome Moly Steel with a 1:10\" twist rate, optimized for 9mm Luger performance in a compact pistol or carbine build.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSalt Bath Nitride (Black Nitride) Finish\u003c\/strong\u003e - Provides superior surface hardness, corrosion resistance, and reduced friction for reliable performance in demanding conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBroad AR-Platform Compatibility\u003c\/strong\u003e - Designed to fit mil-spec AR-15 upper receivers with a modified ejection port and most mil-spec AR-15 lowers with 9mm AR Conversion magazines, including CMMG MkG, MkGs, Mk17, and Mk9 lowers.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eComplete Barrel and BCG Kit\u003c\/strong\u003e - Includes both the barrel and a matched Bolt Carrier Group, providing everything needed for a seamless PCC upper build.\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 CMMG\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number (MPN):\u003c\/strong\u003e 99D517A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 815835019802\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCaliber:\u003c\/strong\u003e 9mm Luger\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBarrel Length:\u003c\/strong\u003e 8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTwist Rate:\u003c\/strong\u003e 1:10\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBarrel Material:\u003c\/strong\u003e Chrome Moly Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Salt Bath Nitride (Black Nitride)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating System:\u003c\/strong\u003e Radial Delayed Blowback (RDB)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlatform Compatibility:\u003c\/strong\u003e Mil-Spec AR-15 with modified ejection port (e.g., CMMG MkG\/MkGs upper receivers); compatible with most mil-spec AR-15 lowers using 9mm AR Conversion mags, and CMMG MkGs, Mk17, Mk9 lowers\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e Replacement Barrel and Bolt Carrier Group (BCG)\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\n]]\u0026gt;","brand":"CMMG","offers":[{"title":"Default Title","offer_id":44134669385850,"sku":"FLX-158965","price":494.98,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1679\/0365\/files\/308988704.png?v=1781056248","url":"https:\/\/tlooutdoors.com\/products\/cmmg-replacement-barrel-and-bcg-kit-9mm-luger-8-inch-black-nitride-chrome-moly-steel-99d517a","provider":"TLO Outdoors","version":"1.0","type":"link"}