Carbine Buffer Tube Kit For AR-15 Black
$28.99 at Ammunition Depot · 4 stores
In stock
Best price
$33.99at GunMag Warehouse
In stock checked Oct 1, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| GunMag Warehouse Best price | $33.99checked Oct 1, 2026 | In stock | Buy at GunMag Warehouse | |
| Ammunition Depot | $36.49checked Oct 1, 2026 | In stock | Buy at Ammunition Depot | |
| Sportsman's Warehouse | $39.99checked Oct 1, 2026 | In stock | Buy at Sportsman's Warehouse | |
| OpticsPlanet | $52.49Salechecked Oct 1, 2026 | In stock | Buy at OpticsPlanet | |
| CMMG | $39.95checked Oct 1, 2026 | Check store | Buy at CMMG | |
| Palmetto State Armory | $39.99checked Oct 1, 2026 | Check store | Buy at Palmetto State Armory | |
| Brownells | $8.46checked 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
Lowest in-stock price in the last 30 days: $33.99 at GunMag Warehouse. Dashed line = out of stock. Tracking since Sep 27, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Ammunition Depot | $36.49 | $36.49 | $36.49 |
| Brownells | $8.46 | $8.46 | $38.08 |
| CMMG | $39.95 | $39.95 | $39.95 |
| GunMag Warehouse | $33.99 | $33.99 | $33.99 |
| OpticsPlanet | $52.49 | $52.49 | $52.49 |
| Palmetto State Armory | $39.99 | $39.99 | $39.99 |
| Sportsman's Warehouse | $39.99 | $39.99 | $39.99 |
Since Sep 27, 2026.
About this part
The AR-15 Mk4 Receiver Extension Kit is an AR-15 buffer part from CMMG. It's sold by 7 stores (4 in stock), from $8.46 to $52.49. The lowest in-stock price in the last 30 days was $33.99 at GunMag Warehouse.
Specifications
- Manufacturer
- CMMG
- Type
- Buffer Kit
- Platform
- AR-15
From the manufacturer
CMMG's engineering team finely tuned the company's line of Mk4 rifles to ensure that they're one of the most reliable, finely made ARs on the market today. However, that tuned construction means that the Mk4 platforms are built with a few components designed specifically for this rifle, like the receiver extension. Whether or not you're looking to upgrade your CMMG Mk4 or you're looking to build a faithful recreation of the company's factory rifles, the CMMG Mk4 Receiver Extension is built exactly the same way with the same attention-to-detail as the company's factory-built rifles. Mfg: Cmmg
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