The Seekins Precision SBA15 Billet lower features oversized winter trigger guard, quick access mag release, and a beveled mag well opening. The oversized built in trigger guard allows for the use of a thick winter glove. The magazine release area has been designed to allow quick and easy access to the release button from any position. Features an upper receiver tensioning screw under the grip, captive detent spring to retain the rear takedown pin. Screw in dowel pins now replace standard roll pins for the Enhanced Bolt Catch and Ambidextrous Bolt Release.