This lower receiver design was engineered to shave weight and increase strength. Now you can have a billet lower receiver with full ambi controls close to the weight of a standard forged receiver without sacrificing any strength. All edges and surfaces have been 3D chamfered to reduce snagging.Features :KNS Mod ST Pin KitProprietary Ambidextrous ControlsRaised Bullet Pictogram Selector MarkingsBuilt in Trigger Guard