FailZero AR-15 Bolt Carrier Group No Hammer EXO Nickel Boron

A: Gavin, this is a "Drop In" all day long Sir.

A: While it is considered a drop in part it's always a good idea to check head space anytime you change the barrel or bolt.

A: Gavin - this is one of the better quality Bolt carrier groups on the market and as long as you are installing it in a mil spec type upper, you can just drop it in and start shooting. Congrats on selecting a quality product.

A: 99.9% of the tome its a drop in

A: Michael, no, The 9mm bolt carrier group is significantly different from its 5.56223 counterpart, and will not work with a 9mm build.

A: Michael, This BCG will not function on a 9 mm build. All you have to do is search "AR-9 build BCG" and there are quite a few good companies making them out there.

A: sorry this BCG will not work with 9MM you will need a 9MM specific BCG like this PSA Gen4 9mm BCG - Nitride - 5165449845

A: Ar-15 only.

A: Pete, it will Sir.

A: Esequiel, yes Sir. This is a 5.56NATO Bolt and will fire both 5.56 and .223 no issues. Cheers!

A: YEA BECAUSE ITS 556 SO 223 WILL ALSO FUNCTION YALL. MUCH LOVE FROM TEXAS.