AR-15 style 9mm pistol with M-LOK compatible free float hand guard. There is a 7″ Chrome-Molly barrel with an A2 flash hider. This pistol uses Glock compatible magazines and includes a 15 round magazine. – LAR-BT9G Aluminum lower – Glock compatible flared mag well – M-LOK compatible hand guard – A2 flash hider – Manufacturer Rock River Arms – Model BT-9G – Action Blowback – Barrel Length 7.0" Barrel – Caliber 9mm Luger (9x19 Para) – Capacity 15 Rounds – Finish Black – Muzzle Type Flash Hider – Optic Mount 1913 Picatinny – Sights Optic Ready – Thread Pattern 1/2x28 TPI