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The Sons of Liberty H2 Buffer is a mil-spec carbine buffer engineered to manage bolt velocity and cycling speed on your AR-15. At 4.6 ounces, it uses two tungsten weights and one steel weight to deliver consistent performance across different ammunition and gas system configurations.
The standard carbine buffer at 3 ounces is fine for baseline setups, but when you add a suppressor, run shorter barrels, or have an overgassed rifle, things get out of balance. The H2 Buffer slows down your bolt carrier group just enough to smooth out the action, reduce felt recoil, and prevent excessive wear on internal components. It’s especially effective on aggressive carbine gas systems where pressure builds quickly.
You’ll see H2 Buffers on SBRs, suppressed rifles, and builds running hot ammo or exotic calibers. The buffer stabilizes cycling so you get reliable function across a wider range of ammunition types. It also reduces bolt bounce and carrier velocity spikes, which means better reliability and longer component life. Many builders pair it with a good buffer spring to fine-tune the feel even more.
This is a straightforward mil-spec replacement that works with any standard carbine buffer tube. No modifications needed, no special tools required. Swap it in and you’ll notice the difference immediately—softer recoil, smoother cycling, and more predictable performance.
The standard carbine buffer weighs about 3 ounces, while the H2 is 4.6 ounces with additional tungsten weights. That extra mass slows down the bolt carrier group, reducing felt recoil and improving cycling control—especially on overgassed rifles, suppressors, or short barrels. The H2 is the most commonly recommended upgrade for modern builds.
If your rifle has a standard mil-spec carbine buffer tube, yes. The H2 is a direct drop-in replacement. That said, buffer choice depends on your gas system, barrel length, and ammunition. Most 16-inch rifles or shorter benefit from it, but a few oversized or undergassed setups might run better with something lighter.
The H2 works fine with your existing buffer spring in most cases. Some builders prefer upgrading the spring too for even smoother operation, but it’s not required. The buffer itself is the drop-in part—just swap it out and run it.
A suppressor increases backpressure and raises bolt carrier velocity. The H2’s extra weight helps counter that effect, keeping cycling smooth and preventing the bolt from slamming back too hard. This reduces wear and gives you more consistent performance across different ammo types when running suppressed.
Yes. If you go too heavy, the rifle can short-stroke or fail to cycle properly. The H2 is calibrated as the starting point for most builds, but matching it to your specific gas system length and ammunition is key. If your rifle won’t lock back or cycles slowly after upgrading, you might need to adjust your gas block or switch to a lighter buffer.
| UPC | 785939517682 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | H2BUFFER |
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