The DDM4A1 RII is designed as a dependable, duty-ready AR-15-pattern rifle built around a fully ambidextrous lower, allowing operation of the bolt catch, safety selector, and magazine release from either side without shifting the firing hand. An ambidextrous GRIP-N-RIP charging handle further supports seamless use by right- or left-handed shooters. Specifications and Features: Caliber: 5.56 NATO Weight: 6.74 lbs Overall Length: 31-1/2" to 34-3/4" Action: Semi-Automatic DI Safety: Ambidextrous Barrel Length: 14.5" Barrel Twist: 1:7 Barrel Thread Pitch: 1/2x28 TPI Stock: Buttstock: Glass Filled Polymer with Soft Touch Overmolding Scope Mount: Daniel Defense M4A1 Rail Interface System (RIS) II Magazines Included: DD Magazine