AR-15/308 6-Position Commercial Carbine Buffer Tube
$22.55 at OpticsPlanet · 2 stores
In stock Sale
308 M4 Extension Tube Cs XP Buffer Spring In Hard Tube
Sprinco USA · Buffer Tubes & Springs
No ratings yetBest price
$19.99at Brownells
In stock checked Oct 2, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Brownells Best price | $19.99checked Oct 2, 2026 | In stock | Buy at Brownells | |
| OpticsPlanet | $21.55Salechecked Oct 2, 2026 | In stock | Buy at OpticsPlanet | |
| Ammunition Depot | $24.99checked Oct 2, 2026 | In stock | Buy at Ammunition Depot | |
| Battlehawk Armory | $18.96Salechecked Oct 2, 2026 | Check store | Buy at Battlehawk Armory | |
| Palmetto State Armory | $20.99checked Oct 2, 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: $19.99 at Brownells. Dashed line = out of stock. Tracking since Sep 27, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Ammunition Depot | $24.99 | $24.99 | $24.99 |
| Battlehawk Armory | $18.96 | $18.96 | $18.96 |
| Brownells | $19.99 | $19.99 | $19.99 |
| OpticsPlanet | $21.55 | $21.55 | $21.55 |
| Palmetto State Armory | $20.99 | $20.99 | $20.99 |
Since Sep 27, 2026.
About this part
The 308 M4 Extension Tube Cs XP Buffer Spring In Hard Tube is an AR-10 buffer part from Sprinco USA. It's sold by 5 stores (3 in stock), from $18.96 to $24.99. The lowest in-stock price in the last 30 days was $19.99 at Brownells.
Specifications
- Manufacturer
- Sprinco USA
- Type
- Buffer Tube
- Platform
- AR-10
From the manufacturer
Extra Extra Power Buffer Spring. The Orange spring is much stouter than the Red spring. The Orange buffer spring was originally engineered for the demands presented by .308 / 6.5 CM / .260 Rem, etc., heavy BCG carbine DPMS Pattern applications using standard 7" Depth M4 extension tubes and short 2.5" buffers (Including aftermarket "heavy buffers") in robustly gassed 16" - 18" ML gas carbine platforms, but has been proven to be a requirement for tuning over gassed carbines of any equivalent heavy calibers in AR-10 pattern tubes with 3.25" buffers or lesser calibers (5.56, etc.). Mfg: Sprinco Usa
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