Best price
$4.99at OpticsPlanet
In stock Sale Lowest in 30 dayschecked Nov 12, 2026
Specifications
- Manufacturer
- Luth-AR
- Color
- Black
- Platform
- AR-15
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| OpticsPlanet Best price | $4.99Salechecked Nov 12, 2026 | In stock | Buy at OpticsPlanet | |
| GunMag Warehouse | $9.99checked Nov 13, 2026 | In stock | Buy at GunMag Warehouse | |
| Battlehawk Armory | $3.07Salechecked Nov 13, 2026 | Check store | Buy at Battlehawk Armory | |
| GrabAGun | $3.39Salechecked Nov 12, 2026 | Check store | Buy at GrabAGun | |
| Palmetto State Armory | $4.99checked Nov 13, 2026 | Check store | Buy at Palmetto State Armory | |
| Brownells 17.76% off · ends Nov 15 · exclusions apply | $5.19checked Nov 13, 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: $4.99 at OpticsPlanet. Dashed line = out of stock. Tracking since Sep 27, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Battlehawk Armory | $3.07 | $3.07 | $4.56 |
| Brownells | $5.19 | $5.19 | $5.19 |
| GrabAGun | $3.39 | $3.39 | $3.39 |
| GunMag Warehouse | $9.99 | $9.99 | $9.99 |
| OpticsPlanet | $4.99 | $4.99 | $4.99 |
| Palmetto State Armory | $4.99 | $4.99 | $4.99 |
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. It's sold by 6 stores (2 in stock), from $3.07 to $9.99. The lowest in-stock price in the last 30 days was $4.99 at OpticsPlanet.
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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