CMMG Barrel and Collar Kit, 9.2" Medium Taper, .22 LR The CMMG Barrel and Collar Kit is the ideal foundation for building a custom dedicated .22 LR AR-15 upper group. Precision-machined from 4140 Chrome Moly steel, this 9.2-inch medium taper barrel delivers exceptional durability and consistent accuracy. A salt bath nitride finish applied inside and out hardens the surface for superior resistance to corrosion and abrasion while reducing friction for smoother cycling. The included barrel collar allows it to replace the chamber adapter on your existing 22AR conversion kit, making it a versatile upgrade for both new builds and existing platforms. Product Highlights Dedicated .22 LR Performance: Purpose-built for AR-15 platforms chambered in .22 Long Rifle, ensuring reliable feed and consistent accuracy. 4140 Chrome Moly Steel Construction: Machined from high-strength steel for long-lasting durability and resilience under repeated use. Salt Bath Nitride Finish (Inside and Out): Provides enhanced corrosion resistance, abrasion resistance, and a low-friction bore surface for improved performance. Includes Barrel Collar: Replaces the chamber adapter on 22AR conversion kits, making this kit suitable for both new builds and conversions. 1:16 Twist Rate and 1/2-28 Muzzle Threads: Optimized stabilization for .22 LR projectiles with standard muzzle threading for suppressor and muzzle device compatibility. Specs Brand: CMMG Caliber: .22 Long Rifle Barrel Length: 9.2 in Barrel Profile: Medium Taper Material: 4140 Chrome Moly Steel Finish: Salt Bath Nitride Twist Rate: 1:16 Muzzle Threads: 1/2-28 Compatible Platform: AR-15 Weight: 2 lbs UPC: 815835016061 MPN: CMM22D8F24 Disclaimer: 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.