Since the AR-15 at-home-build bug bit me a few ... The lower receiver this rifle is built around is F-1 Firearms skeletonized Mil-Spec compatible UDR-15 3G Style 2 Universal model.

Ever since posting Building a Custom AR-15 at Home a couple of years ago ... trigger pull according to a Lyman’s digital trigger gauge. The skeletonized milled-billet aluminum pistol grip ...