Brn-4 Hk416 Buffer Retainer
$7.99 at Brownells
In stock Sale
AR-15 Buffer Retainer Stainless Steel
Forward Controls Design · Buffer Tubes & Springs
No ratings yetBest price
$7.60at Brownells
In stock checked Oct 1, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Brownells Best price | $7.60checked Oct 1, 2026 | In stock | Buy at Brownells | |
| OpticsPlanet | $7.99Salechecked Oct 1, 2026 | In stock | Buy at OpticsPlanet | |
| Ammunition Depot | $12.49checked Oct 1, 2026 | In stock | Buy at Ammunition Depot | |
| Battlehawk Armory | $7.41Salechecked Oct 1, 2026 | Check store | Buy at Battlehawk Armory | |
| Palmetto State Armory | $7.99checked Oct 1, 2026 | Check store | Buy at Palmetto State Armory |
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: $7.60 at Brownells. Dashed line = out of stock. Tracking since Sep 27, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Ammunition Depot | $12.49 | $12.49 | $12.49 |
| Battlehawk Armory | $7.41 | $7.41 | $7.41 |
| Brownells | $7.60 | $7.60 | $7.60 |
| OpticsPlanet | $7.99 | $7.99 | $7.99 |
| Palmetto State Armory | $7.99 | $7.99 | $7.99 |
Since Sep 27, 2026.
About this part
The AR-15 Buffer Retainer Stainless Steel is an AR-15 buffer part from Forward Controls Design. It's sold by 5 stores (3 in stock), from $7.41 to $12.49. The lowest in-stock price in the last 30 days was $7.60 at Brownells.
Specifications
- Manufacturer
- Forward Controls Design
- Type
- Buffer
- Platform
- AR-15
- Material
- Steel
From the manufacturer
RBF (Reinforced Buffer retainer, Forward Controls) is a strengthened AR buffer retainer machined with Swiss machines from 17-4 stainless steel bar stock, and heat treated to H900 hardness. RBF features a reinforced tip that is 10% larger (0.102) than TDP spec (0.093). FCD didn't want RBF to be timed (as the case with a rectangular tip), so RBF retains the TDP buffer retainer's versatile round tip and is installed per TM instructions. 10% is as much as we could increase before encountering receiver extension timing incompatibilities. RBF is compatible with AR15/M16 mil-spec rifle and carbine receiver extensions, as well as Vltor A5 system receiver extension Mfg: Forward Controls Design
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