Buffer Tube Receiver Extension Lock Nut For AR-15 Black
$9.99 at OpticsPlanet · 2 stores
In stock Sale
Best price
$10.99at Ammunition Depot
In stock checked Oct 1, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Ammunition Depot Best price | $10.99checked Oct 1, 2026 | In stock | Buy at Ammunition Depot | |
| OpticsPlanet | $13.49Salechecked Oct 1, 2026 | In stock | Buy at OpticsPlanet | |
| GunMag Warehouse | $13.99checked Oct 1, 2026 | In stock | Buy at GunMag Warehouse | |
| Battlehawk Armory | $6.99checked Oct 1, 2026 | Check store | Buy at Battlehawk Armory | |
| Palmetto State Armory | $9.49Salechecked Oct 1, 2026 | Check store | Buy at Palmetto State Armory | |
| Brownells | $9.29checked 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: $10.99 at Ammunition Depot. Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Ammunition Depot | $10.99 | $10.99 | $10.99 |
| Battlehawk Armory | $6.99 | $6.99 | $6.99 |
| Brownells | $9.29 | $9.29 | $9.29 |
| GunMag Warehouse | $13.99 | $13.99 | $13.99 |
| OpticsPlanet | $13.49 | $9.99 | $14.99 |
| Palmetto State Armory | $9.49 | $9.49 | $9.49 |
Since Sep 28, 2026.
About this part
The Extension AR-15/M16 M4 Receiver Castle Nut is an AR-15 buffer part from Ergo Grips. It's sold by 6 stores (3 in stock), from $6.99 to $13.99. The lowest in-stock price in the last 30 days was $10.99 at Ammunition Depot.
Specifications
- Manufacturer
- Ergo Grips
- Type
- Buffer Tube
- Platform
- AR-15
From the manufacturer
Falcon Industries/ERGO brings this receiver extension castle nut for M4 style receiver extension tubes. Mfg: Ergo Grips
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