The Forward Controls Design Billet Castle Nut is a machined-from-billet replacement castle nut for AR-15 receiver extensions, finished in Black (Forward Controls Design part no. CNF (CASTLE NUT) BLK).

Key Specifications

• Machined from billet material rather than cast/stamped.
• Finished in Black.
• Built for AR-15 pattern receiver extensions.
• Classified as a firearm part/accessory, not a regulated firearm itself — no FFL transfer required to purchase.

Frequently Asked Questions

What is a castle nut used for? A castle nut threads onto the receiver extension (buffer tube) to lock the stock/end plate in place.

What platform does this castle nut fit? It’s built for AR-15 pattern receiver extensions.

Buy the Forward Controls Design AR-15 Billet Castle Nut – Black

Order the Forward Controls Design AR-15 Billet Castle Nut – Black from a Lubbock, TX gun shop. Browse more Forward Controls Design parts in our Rifle Parts category.