The Forward Controls Design A5 Castle Nut is a replacement castle nut sized for the A5-pattern receiver extension, finished in Black (Forward Controls Design part no. CN5F).

Key Specifications

• Sized for the A5-pattern receiver extension.
• Finished in Black.
• Classified as a firearm part/accessory, not a regulated firearm itself — no FFL transfer required to purchase.

Frequently Asked Questions

What is the A5 receiver extension system? The A5 system uses a longer, rifle-length-diameter receiver extension on a carbine-length lower to allow a rifle-length buffer spring in a carbine-length stock.

What finish does this castle nut come in? This castle nut is finished in Black.

Buy the Forward Controls Design A5 Castle Nut – Black

Order the Forward Controls Design A5 Castle Nut – Black from a Lubbock, TX gun shop. Browse more Forward Controls Design parts in our Rifle Parts category.