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The TacFire MAR049B is a no-fuss way to complete the rear of your AR-15 pistol build without hunting down five separate parts. It bundles a mil-spec pistol buffer tube with a foam insert, a 3 oz carbine buffer, a carbine-length buffer spring, a dual-loop sling adapter end plate, and a castle nut. In other words, thread it on, torque the nut, and you're ready to move to the next stage of your build.
A pistol receiver extension is smooth on the outside with no position notches, unlike a carbine tube that has a rail and detents for a collapsible stock. That smooth profile is what makes it a proper pistol tube, and the included nitrile-style foam wrap gives you a cheek reference and a bit of padding against bare aluminum. The bore that holds the buffer and spring is the same as a carbine setup, which is why the 3 oz buffer and carbine spring drop right in and cycle a standard 5.56 or .223 gas system reliably.
This is a mil-spec tube, measuring roughly 1.148 inches at the mounting surface, so it works with mil-spec end plates and hardware rather than the slightly larger commercial diameter. The 6061 T6 aluminum construction keeps things light while holding up to repeated cycling, and the whole tube runs about 8 inches long. If you're running a heavier caliber like .300 Blackout or a short-barreled setup, keep in mind you may want to tune buffer weight down the road, but the included 3 oz carbine buffer is the standard starting point for most 5.56 builds.
Budget-minded builders and folks putting together their first AR pistol tend to reach for a kit like this because it takes the guesswork out. The dual-loop sling adapter end plate is a nice bonus too, giving you a spot to run a two-point sling without buying a separate mount. It's a straightforward, get-it-done package that covers the essentials.
The kit includes a mil-spec pistol buffer tube with a foam insert, a 3 oz carbine buffer, a carbine-length buffer spring, a dual-loop sling adapter end plate, and a castle nut. That covers everything you need to finish the back of an AR-15 pistol lower. You'll just need the correct tools to torque the castle nut during install.
Yes, this is a mil-spec tube measuring around 1.148 inches at the mounting surface, so it threads onto standard mil-spec AR-15 pistol lowers. It works with mil-spec end plates and hardware rather than the slightly larger commercial-diameter parts. If your lower is set up for commercial-spec, this tube is not the match.
The included 3 oz buffer is the standard carbine weight and is the typical starting point for most 5.56 and .223 AR pistol builds. If you're running a heavier caliber like .300 Blackout, a suppressor, or a very short barrel, you may want to experiment with a heavier buffer to smooth out the cycle. For a common 5.56 setup, the 3 oz buffer should run fine out of the box.
It does. The internal bore that holds the buffer and spring is identical to a carbine tube, which is why the included carbine buffer and spring drop right in. The main difference is the smooth outer profile with no position notches, which is what makes it a pistol receiver extension.
| UPC | 811261023734 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MAR049B |
| Product Type | Buffer Assembly |
| Shipping Weight | 0.72 |
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