This is a LBE Unlimited Buffer Tube, model PBT-BLK.
LBE Unlimited is a quality manufacturer of AR-15 parts and accessories. This particular item is an AR-15 pistol buffer tube/receiver extension. This buffer tube can be used as a replacement unit or as a spare for a new build. This unit is pre-threaded and will install easily to any standard pattern AR-15 lower receiver.
Features:
Black finish
AR-15 Pistol buffer tube
Pre-threaded
Compatible with Mil-Spec AR-15 Lower Receivers and similar pattern units
