AT3 Tactical .22LR Pencil Profile 16 Inch AR-15 Barrel Black. 22LR to your AR build with this Pencil Profile 16? barrel from AT3. Crafted from premium 4150 CrMoV steel per MIL-B-11595E specs and protected by a rugged black nitride finish. The Pencil profile trims weight while maintaining accuracy with .22LR ammunition. At just 16? long with 1/228 muzzle threads its a carbine length option for dedicated .22LR AR uppers. Designed for reliable cycling when paired with the AT3 .22LR bolt carrier group and Black Dog Machine magazines. This tough little barrel delivers consistent rimfire performance in a space-saving platform. Specifications for AT3 Tactical .22LR Pencil Profile AR-15 Barrel: Manufacturer: AT3 Tactical Color: Black Caliber: .22 Long Rifle Barrel Length: 16 in Barrel Profile: Pencil Gun Make: AR Platform Gun Model: AR-15 Package Contents: AT3 Tactical .22LR Pencil Profile AR-15 Barrel What firearm models does the manufacturer say AT3 Tactical .22LR Pencil Profile AR-15 Barrel is compatible with? The manufacturer suggests that AT3 Tactical .22LR Pencil Profile AR-15 Barrel is compatible with AR-15AT3 Tactical AT3-22LR-PEN-16: .22LR Pencil Profile 16 Inch AR-15 Barrel Black