Fostech Ultra-Lite Castle Nut Black

Name: Fostech Ultra-Lite Castle Nut Black
Brand: Fostech
Availability: InStock

Fostech · Buffer Tubes & Springs

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Best price

$21.99at OpticsPlanet

In stock Sale checked Nov 3, 2026

Buy at OpticsPlanet

Where to buy

Store	Price	Availability	Buy	Add to build
OpticsPlanet	$21.99Salechecked Nov 3, 2026	In stock	Buy at OpticsPlanet

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Price history

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Lowest in-stock price in the last 30 days: $21.99 at OpticsPlanet. Dashed line = out of stock. Tracking since Oct 27, 2026.

Show the prices as a table

Store	Latest	Lowest	Highest
OpticsPlanet	$21.99	$21.99	$21.99

Since Oct 27, 2026.

About this part

The Fostech Ultra-Lite Castle Nut Black is an AR-15 buffer part from Fostech. One store lists it, OpticsPlanet at $21.99. The lowest in-stock price in the last 30 days was $21.99 at OpticsPlanet.

Specifications

Manufacturer: Fostech
Platform: AR-15
Material: Aluminum

From the manufacturer

Fostech Ultra-Lite Castle Nut Black. Fostech machined these AR15 Lower Parts from their proprietary lightweight material. Swapping in this Fostech 2505 Lightweight Castle Nut will reduce your build by 0.34oz compared to a standard castle nut. Save weight and keep the strength with the Fostech Ultra-Light Castle Nut. Specifications for Fostech Ultra-Lite Castle Nut: Manufacturer: Fostech Gun Model: AR-15 Color: Black Fabric/Material: Aluminum Features of Fostech Ultra-Lite Castle Nut Lightweight Machined Staking Notches Package Contents: Fostech Ultra-Lite Castle Nut What firearm models does the manufacturer say Fostech Ultra-Lite Castle Nut is compatible with? The manufacturer suggests that Fostech Ultra-Lite Castle Nut is compatible with AR-15Fostech 2505: Ultra-Lite Castle Nut Black