FN 20100043 AR15 5.56x45mm NATO 20 Button Rifled M16 Profile Rifle Length Gas System Black Phosphate Cold Hammer Forged Chrome Lined UPC: 845737008550

Designed in the M16 styling and made from strong mil-spec steel boasting black manganese phosphate finishing, this 20 button rifled FN America barrel is an ideal solution for any rifle length AR-15 rifle. Chambered in .223 Rem / 5.56x45mm, the chrome lined chamber with its feed ramp will provide more consistent and reliable feeding while shooting. This barrel also features a 1/2 x 28 threaded muzzle and a 1:7 RH twist rate.