The UDP-9 SBR is a compact, lightweight 9mm AR-15 short barrel rifle. It accepts 9mm double stack GLOCK magazine and features last round bolt hold open.MANUFACTURER: Angstadt ArmsMPN: AAUDP09S06MODEL: UDP-9Action: Semi-automaticBarrel Length: 6″Capacity: 17 RoundsFinish: AnodizedCaliber: 9MMGrips: B5Safety: Manual SafetyColor: BlackStock: B5 Bravo