AR-15 Billet Castle Nut Black

Name: AR-15 Billet Castle Nut Black
Brand: Forward Controls Design
Availability: InStock

Forward Controls Design · Buffer Tubes & Springs

No ratings yet

Best price

$19.00at Brownells

In stock checked Oct 1, 2026

Buy at Brownells

Compare 3 stores

Where to buy

Store	Price	Availability	Buy
Brownells Best price	$19.00checked Oct 1, 2026	In stock	Buy at Brownells
OpticsPlanet	$19.99Salechecked Oct 1, 2026	In stock	Buy at OpticsPlanet
Palmetto State Armory	$19.99checked Oct 1, 2026	Check store	Buy at Palmetto State Armory

Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.

Price history

Show

Lowest in-stock price in the last 30 days: $19.00 at Brownells. Dashed line = out of stock. Tracking since Sep 27, 2026.

Show the prices as a table

Store	Latest	Lowest	Highest
Brownells	$19.00	$19.00	$19.00
OpticsPlanet	$19.99	$19.99	$19.99
Palmetto State Armory	$19.99	$19.99	$19.99

Since Sep 27, 2026.

About this part

The AR-15 Billet Castle Nut Black is an AR-15 buffer part from Forward Controls Design. It's sold by 3 stores (2 in stock), from $19.00 to $19.99. The lowest in-stock price in the last 30 days was $19.00 at Brownells.

Specifications

Manufacturer: Forward Controls Design
Platform: AR-15
Material: Steel

From the manufacturer

The TDP spec castle nut is a simple and robust fastener that is almost perfect for the job it's tasked to perform. CNF (Castle Nut, Forward Controls) is based on the TDP spec castle nut, with now 4 staking notches that are longer and deeper (30 degrees notch vs. TDP castle nut's 45 degrees) and coarse serrations on the wrench side of the nut. The CNF has longer and deeper notch that once installed and staked, will not loosen without the user's deliberate action. CNF is billet machined in 4140 PH steel, and black nitrided. As with everything Forward Controls Design produces, it is proudly made in the USA. 4140 billet steel AR15M16 castle nut Mfg: Forward Controls Design