Introducing the CMMG 4.5" Barrel Sub-assembly with Collar Kit designed specifically for .22 Long Rifle cartridges. This robust medium contour barrel features a sleek black finish and is expertly crafted for AR-15 platforms. The 1/2-28 muzzle threads allow for easy attachment of various muzzle devices while the 1-16 twist rate ensures superior accuracy and performance. Upgrade your AR-15 with this precision-engineered 4.5" barrel sub-assembly perfect for enhancing your shooting experience with .22 LR rounds.