Extension AR-15/M16 M4 Receiver Castle Nut
$10.99 at Ammunition Depot · 6 stores
In stock
Buffer Tube Receiver Extension Lock Nut For AR-15 Black
Aero Precision · Buffer Tubes & Springs
No ratings yetBest price
$9.99at OpticsPlanet
In stock Sale checked Oct 1, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| OpticsPlanet Best price | $9.99Salechecked Oct 1, 2026 | In stock | Buy at OpticsPlanet | |
| Brownells | $8.99checked Oct 1, 2026 | Out of stock | Buy at Brownells |
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
Lowest in-stock price in the last 30 days: $9.99 at OpticsPlanet. Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Brownells | $8.99 | $8.99 | $8.99 |
| OpticsPlanet | $9.99 | $9.99 | $9.99 |
Since Sep 28, 2026.
About this part
The Buffer Tube Receiver Extension Lock Nut For AR-15 Black is an AR-15 buffer part from Aero Precision. It's sold by 2 stores (1 in stock), from $8.99 to $9.99. The lowest in-stock price in the last 30 days was $9.99 at OpticsPlanet.
Specifications
- Manufacturer
- Aero Precision
- Type
- Buffer Tube
- Platform
- AR-15
From the manufacturer
Mil-spec. receiver extension lock nut (castle nut) for use on AR15 carbines with an adjustable stock. Perfect for your new build or as a direct replacement for worn out parts. Made in the USA. Mfg: Aero Precision
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