Machined exclusively for Wilson Combat by a renowned, mil-spec contractor, these .308 AR Bolt Carrier Assemblies are some of the best options available on the market today. Designed for use with DPMS-pattern guns, these are the exact same bolt-carrier groups that Wilson Combat uses in its finished rifles, and you can add the same degree of quality to your short-action ARs! Each Wilson Combat AR .308 Bolt Carrier Assembly features a bolt machined from Carpenter 158 steel, which is complete with an extractor and hardened ejector machined from S7 tool steel. These components sit inside of a bolt carrier machined from hardened 8620 steel, which is finished smooth without any forward-assist serrations. Finished with a nickel-boron treatment that reduces surface friction and adds durability, the Wilson Combat Ar .308 Bolt Carrier Assembly features a properly staked gas key and is designed to allow for a perfect, drop-in fit into any DPMS-pattern AR .308 rifle without a forward assist. The bolt-carrier assembly can be used on guns chambered in .308 Win., 7.62 NATO, 6.5 Creedmoor, .260 Rem. or any other .308-based cartridge.