Faxon's AR-15 Pencil Integral Rifle Barrels are the perfect choice for any shooter who is looking for the maneuverability of a shorter overall length but want the compatibility and versatility that comes with an AR15 build. Faxon AR-15 5.56 Pencil barrels have a narrow O.D. both fore and aft of the gas block, for maximum weight saving. With Faxon's Integral Muzzle Device Barrels customers will no longer be locked into a single configuration on their rifle build or be dependent on finding a capable gunsmith to pin & weld their muzzle device to their barrel. Shooters can choose from a 3-port muzzle device or slotted flash hider, allowing the full assembly and disassembly Mfg: Faxon Firearms