The Noveske N6 4th Generation AR-15 Receiver Set is made from presicion machined billet aluminum with an oversized flared magwell and integrated oversized trigger guard. This receiver set is the perfect foundation for your next AR build. Note: This is a Large Frame lower receiver and is designed to work with Noveske large frame uppers. Will NOT work on small AR-15 frame upper. FeaturesAmbidextrous Bolt ReleaseAmbidextrous Magazine ReleaseAdjustable Tension Screw for Perfect Fit Between Upper and LowerBillet AluminumUpper Receiver Features Anti-Rotation Interface with Handguard