PCC specific parts

The Heat-Treated Castle Nut screws onto the AR15/M4 lower receiver extension (buffer tube) and keeps the receiver extension and lower receiver end plate secured in place.  The large notches allow for positive engagement with a castle nut wrench for proper installation and torque.  The smaller notches provide a location for the end user to stake the castle nut to prevent accidental loosening.

Finished in a Mil-spec manganese phosphate.

The Magpul M-LOK Bipod Mount allows for the attachment of most Harris®-style stud mounted bipods to M-LOK compatible hand guards and forends. The M-LOK Bipod Mount offers a low-profile, robust, and elegant mounting solution for the most common bipods on the market.  By utilizing the direct-connect properties of the M-LOK system, the bipod sits closer to the mounting surface than other adapters while providing superior support to the bipod for strength and stability.

Designed for use with all M-LOK compatible hand guards and forends, our 11-slot M-LOK Polymer Rail Sections provide a cost effective method of attaching various 1913 Picatinny-Spec rail-mounted accessories such as lights, vertical grips, etc. Injection molded from a proprietary reinforced composite for enhanced strength and durability while remaining lightweight, our M-LOK Polymer Rail Sections also feature beveled ends to reduce snagging and eliminate sharp corners and edges.

Magpul M-LOK QD Sling Mount provides a forward attachment point for the Magpul MS4 Sling and other push-button QD slings. 

The M-LOK T-Nut Replacement Set is a replacement hardware pack designed for use with all M-LOK accessories. Made of 4140 Chromoly Steel with a Mil-Spec Manganese Phosphate finish, the hardware set is supplied with two T-Nuts as well as two different length button-head cap screws to ensure compatibility with various hand guard or forend thicknesses.