Noveske Gen 4 precision machined billet receiver from 7075-T6 aluminum - Oversized flared magazine well - Improved ergonomic integrated oversized trigger guard - Ambidextrous bolt release - Ambidextrous magazine release with improved fencing - Hardcoat type III anodizing - Adjustable tension screw for perfect fit between upper and lower - Includes ambidextrous bolt release and magazine catch hardware