Rock River Arms BT-9 AR Pistol

The latest entry in Rock River’s 9mm AR pistol category is its shortest to date—the new BT-9 ($1,350). Built on a billet aluminum lower receiver with a Glock-compatible flared magwell and integral winter trigger guard, it features a blow-back operating system, chrome-lined 4.5-inch chrome moly barrel rifled at a 1:10” twist rate, Smith Vortex flash suppressor, muzzle threaded 1/2” x 36 TPI, extruded aluminum A4 upper receiver with Picatinny top rail, and a 4.25-inch RRA lightweight aluminum free-floated handguard with Picatinny top rail and one M-LOK slot per side. Other features include RRA’s excellent 2-stage trigger, Hogue rubber pistol grip and an SB Tactical SBA3 stabilizing arm brace with five adjustment positions. It will accept all Glock 9mm magazines and comes with one clear 17-round Glock-pattern mag. Fully extended length is 23.5 inches, but empty weight and collapsed length were not available at press time. Contact Rock River Arms; Tel.: (309) 792-5780: Web: