The J P Enterprises Enhanced Carbine Buttstock Castle Nut is a receiver-extension hardware part from J P Enterprises (brand part no. JPCBS-N) that threads onto an AR-15 buffer tube to clamp the lock plate and endplate in position. A properly torqued castle nut keeps the buffer tube from backing out of the receiver under recoil, which is critical for both reliability and safety. This enhanced version is machined to tighter tolerances for a more positive, consistent lockup than a stamped mil-spec castle nut.

Key Specifications

• It threads onto the buffer tube to clamp the lock plate and endplate securely against the receiver.
• A properly torqued castle nut keeps the buffer tube from backing out of the receiver under recoil.
• It is machined to enhanced tolerances for a more consistent lockup than a stamped mil-spec castle nut.

Frequently Asked Questions

What does a castle nut do? It threads onto the buffer tube and clamps the lock plate and endplate tight against the receiver, keeping the buffer tube from backing out under recoil.

Is this a direct replacement for a mil-spec castle nut? Yes, it threads onto a standard AR-15 buffer tube in place of a mil-spec castle nut.

Buy the J P Enterprises Enhanced Carbine Buttstock Castle Nut

Order the J P Enterprises Enhanced Carbine Buttstock Castle Nut through our rifle parts selection at Schaefer Defense and we will ship it fast, fully insured, from our Lubbock, TX gun shop.