CMMG Barrel and Collar Kit M4 Profile 22LR 16.1in 4140CM SBN Finish Black. Also Includes barrel collar to replace the chamber adaptor on your 22ARC. Features of CMMG Inc Barrel And Collar Kit 22lr 16inch Cm M4 Ss Collar: 16.1" M4 Profile 4140 Chrome Moly Salt Bath Nitride Finish inside and out 1:16 Twist 22LR Sporting Chamber Threaded 1/2-28 .750" Carbine length Journal Package Contents: CMMG Inc Barrel And Collar Kit 22lr 16inch Cm M4 Ss Collar Specifications for CMMG 22LR M4 Profiled Barrel and Collar Kit: Manufacturer: CMMG Color: Black Finish: Salt Bath Nitride Fabric/Material: 4140 Chrome-Moly Steel Caliber: .22 Long Rifle Barrel Length: 16.1 in Barrel Profile: M4 Gas System Length: Carbine Length Gas Block Journal Size-Diameter: .750 in Threads per Inch: 1/2x28 Barrel Twist Rate: 1-16 Flutes: No Gun Make: AR Platform Gun Model: AR-15 Weight: 1.6 lb Condition: New Package Contents: CMMG 22LR M4 Profiled Barrel and Collar Kit The CMMG Inc 16.1 inch .22 LR M4 Profiled Barrel and Collar Kit is a quality addition to the CMMG lineup. For more great deals on AR15 Barrels by CMMG please browse our CMMG Inc Gun Parts page. What firearm models does the manufacturer say CMMG 22LR M4 Profiled Barrel and Collar Kit is compatible with? The manufacturer says that CMMG 22LR M4 Profiled Barrel and Collar Kit is compatible with AR-15CMMG 22D7C4A: Barrel and Collar Kit M4 Profile 22LR 16.1in 4140CM SBN Finish Black