Best price
$5.19at Brownells
Out of stock checked Oct 1, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Brownells | $5.19checked 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
Dashed line = out of stock. Tracking since Sep 27, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Brownells | $5.19 | $5.19 | $5.19 |
Since Sep 27, 2026.
About this part
The AR-15 MBA-3/MBA-4 Carbine Castle Nut Black Steel is an accessory from Luth-AR. One store lists it, Brownells at $5.19.
Specifications
- Manufacturer
- Luth-AR
- Color
- Black
- Platform
- AR-15
From the manufacturer
The Luth-AR Carbine Lock Ring/Castle Nut for MBA-3 and MBA-4 Carbine Buffer Kits Only.
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