AR-15 Mk4 Receiver Extension Kit
$33.99 at GunMag Warehouse · 7 stores
In stock
Best price
$52.99at GunMag Warehouse
In stock checked Oct 21, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| GunMag Warehouse Best price | $52.99checked Oct 21, 2026 | In stock | Buy at GunMag Warehouse | |
| MidwayUSA | $63.99checked Oct 21, 2026 | In stock | Buy at MidwayUSA | |
| OpticsPlanet | $68.79Salechecked Oct 21, 2026 | In stock | Buy at OpticsPlanet | |
| Sportsman's Warehouse | $74.99checked Oct 21, 2026 | In stock | Buy at Sportsman's Warehouse | |
| Ammunition Depot | $84.49checked Oct 21, 2026 | In stock | Buy at Ammunition Depot | |
| Brownells | $92.99checked Oct 21, 2026 | In stock | Buy at Brownells | |
| Palmetto State Armory | $86.99checked Oct 21, 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: $52.99 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 | $84.49 | $84.49 | $84.49 |
| Brownells | $92.99 | $92.99 | $92.99 |
| GunMag Warehouse | $52.99 | $52.99 | $52.99 |
| MidwayUSA | $63.99 | $62.99 | $63.99 |
| OpticsPlanet | $68.79 | $68.79 | $71.59 |
| Palmetto State Armory | $86.99 | $86.99 | $86.99 |
| Sportsman's Warehouse | $74.99 | $74.99 | $74.99 |
Since Sep 27, 2026.
About this part
The AR15 Carbine Receiver Extension Kit is an AR-15 buffer part from CMMG. It's sold by 7 stores (6 in stock), from $52.99 to $92.99. The lowest in-stock price in the last 30 days was $52.99 at GunMag Warehouse.
Fits and works with
- Buffer system
- Carbine · Buffers and springs
Specifications
- Manufacturer
- CMMG
- Type
- Buffer Kit
- Platform
- AR-15
From the manufacturer
In the middle of an AR-15 build? Don't worry about all the parts at the butt-end of your AR-15. CMMG has you covered with the company's AR-15 Receiver Extension Kit, providing you with all the components you need to complete the receiver extension on your gun. Each CMMG Receiver Extension Kit includes the company's six-position receiver extension, ensuring that users get the most in adjustable length-of-pull from their guns. Combined with that are the Carbine-style buffer assembly and action spring, which are designed to run reliably with most standard, carbine-length AR-15s on the market. Mfg: Cmmg
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