LBE Unlimited AR-15/M4 Buffer Tube Kit with H2 Buffer Black
$114.99 at OpticsPlanet · 3 stores
In stock Sale
Best price
$119.99at GunMag Warehouse
In stock checked Oct 31, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| GunMag Warehouse Best price | $119.99checked Oct 31, 2026 | In stock | Buy at GunMag Warehouse | |
| MidwayUSA | $128.25checked Oct 31, 2026 | In stock | Buy at MidwayUSA | |
| Kentucky Gun Co | $128.25checked Oct 31, 2026 | In stock | Buy at Kentucky Gun Co | |
| AR15Discounts | $128.25checked Oct 31, 2026 | Check store | Buy at AR15Discounts | |
| Dirty Bird | $128.25checked Oct 31, 2026 | Check store | Buy at Dirty Bird | |
| Classic Firearms | $128.25checked Oct 31, 2026 | Check store | Buy at Classic Firearms | |
| Battlehawk Armory | $128.95Salechecked Oct 31, 2026 | Check store | Buy at Battlehawk Armory | |
| Palmetto State Armory | $128.99Salechecked Oct 31, 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: $119.99 at GunMag Warehouse. Dashed line = out of stock. Tracking since Oct 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| AR15Discounts | $128.25 | $128.25 | $128.25 |
| Battlehawk Armory | $128.95 | $128.95 | $128.95 |
| Classic Firearms | $128.25 | $128.25 | $128.25 |
| Dirty Bird | $128.25 | $128.25 | $128.25 |
| GunMag Warehouse | $119.99 | $119.99 | $119.99 |
| Kentucky Gun Co | $128.25 | $128.25 | $128.25 |
| MidwayUSA | $128.25 | $128.25 | $128.25 |
| Palmetto State Armory | $128.99 | $128.99 | $128.99 |
Since Oct 28, 2026.
About this part
The B5 Systems AR-15 Sierra K Mini Buffer Kit is an AR-15 buffer part from B5 Systems. It's sold by 8 stores (3 in stock), from $119.99 to $128.99. The lowest in-stock price in the last 30 days was $119.99 at GunMag Warehouse.
Specifications
- Manufacturer
- B5 Systems
- Type
- Buffer Kit
- Platform
- AR-15
From the manufacturer
The B5 Systems Sierra K Extension Kit is specifically designed for use with the Sierra K compact stock. This shortened receiver extension kit includes a receiver extension, buffer, spring, castle nut, and QD end plate. Specifications: Color: Black Type: Buffer Tube Kit
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