AR-15 Pistol Buffer Tube Assembly Package
$54.49 at Ammunition Depot · 5 stores
In stock
Best price
$53.99at MidwayUSA
In stock checked Oct 1, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| MidwayUSA Best price | $53.99checked Oct 1, 2026 | In stock | Buy at MidwayUSA | |
| OpticsPlanet | $66.59Salechecked Oct 1, 2026 | In stock | Buy at OpticsPlanet | |
| CMMG | $59.95checked Oct 1, 2026 | Check store | Buy at CMMG | |
| Brownells | $56.15checked 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: $53.99 at MidwayUSA. Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Brownells | $56.15 | $56.15 | $56.15 |
| CMMG | $59.95 | $59.95 | $59.95 |
| MidwayUSA | $53.99 | $53.99 | $53.99 |
| OpticsPlanet | $66.59 | $66.59 | $66.59 |
Since Sep 28, 2026.
About this part
The AR-15 Fastback Receiver Extension Mil-Spec is an AR-15 buffer part from CMMG. It's sold by 4 stores (2 in stock), from $53.99 to $66.59. The lowest in-stock price in the last 30 days was $53.99 at MidwayUSA.
Specifications
- Manufacturer
- CMMG
- Type
- Buffer Tube
- Platform
- AR-15
From the manufacturer
Thanks to CMMG's unique Fastback Receiver Extension, you can now instantly deploy your stock or stabilizing brace to the exact position you need it from its collapsed position. Designed to accept all mil-spec buffer tubes, the Personal Position Preset system gives you several different lengths to choose from. All you have to do is set the indexing screw into the hole of your choice to set your preferred length. Once it's adjusted, simply pull the brace or stock to the rear, and the Fastback Receiver Extension will allow the unit to slide rearward until it hits the screw, and you're locked into place and ready to shoot! Each CMMG Fastback Receiver Extension is machined fro Mfg: Cmmg
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