SLR-B15 Ambi Billet Lower ReceiverSpecifications: Machined in house from 7075 Billet Aluminum Mil-Spec internal dimensions , Low Shelf Very tight fitting on upper receivers Black Type 3 Mil-Spec Hard Coat Ambi bolt release. Includes lever installed with bolt catch and hardware Threaded Bolt catch. No roll pins Includes SLR front and rear takedown dines installed with springs and detents Threaded rear take down detent bore. Screw and wrench included Includes trigger reset adjustment screws and upper tension adjustment screws Weight: 8.5 QD Sling Points on rear of receiver Compatible with PDW style stocks