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The Armaspec SMB-H3 Buffer Kit takes one of the most overlooked parts of an AR-15 and makes it feel a whole lot better. If you've ever noticed that metallic sproing every time your buffer cycles, that's the spring dragging against the inside of the tube. Armaspec's Sound Mitigation Buffer is a single-stage captured system that keeps the spring off the wall for a smoother, quieter cycle, and it drops in without any fuss. The H3 weight comes in at 5.6 ounces total, putting it on the heavier end of the lineup for folks who want a slower, more controlled feel.
Instead of running a loose buffer and spring like a standard setup, the SMB captures everything around a polymer base and guide rod. That's what keeps the spring centered and stops it from rubbing the tube wall, which is where the noise and a lot of the roughness come from. The result is a cycle that feels more consistent shot to shot, with a noticeable drop in felt recoil. It's a favorite for anyone chasing a refined, buttoned-up feel without changing the whole character of their rifle.
This is the full kit, so you're not hunting for extra parts. Inside the box you get the buffer tube, the H3 buffer, the polymer base guide rod, the spring, an end plate, and a castle nut. That makes it a solid one-stop option whether you're building a lower from scratch or freshening up a rifle that's seen a few thousand rounds. It fits mil-spec AR-15 lowers, so installation is about the same as swapping any receiver extension and buffer.
One detail worth knowing: the spring is tunable. Each coil is roughly a quarter pound of tension, so you can trim it down to fine-tune your cycling if you're running a suppressor or an adjustable gas block. Made in the USA and backed by Armaspec's lifetime warranty, it's an easy upgrade that pays off every time you pull the trigger.
Both, really. The captured design keeps the spring from rubbing the inside of the buffer tube, which kills off that classic buffer twang for quieter operation. At the same time, the H3 weight and captured system smooth out the cycle and take the edge off felt recoil.
Not at all. It's a drop-in replacement, so installation is about the same as swapping any mil-spec receiver extension and buffer, and most folks can knock it out in a few minutes. If you'd rather not wrench on the castle nut and end plate yourself, an armorer can handle it quickly.
The H3 comes in around 5.6 ounces total, which sits on the heavier side and gives you a slower, more controlled cycle. It's a good match for rifles running a suppressor, an adjustable gas block, or anyone who just wants to soften things up. If your gas system runs light, the spring is trimmable to help you dial in reliable cycling.
No, this version is built for AR-15 pattern builds. Armaspec offers separate SMB kits made specifically for AR-10/.308 and 9mm platforms, so grab the one that matches your rifle.
| UPC | 810048492756 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | ARM268-H3 |
| Color | Black |
| Model | |
| Product Type | Buffer Tube Complete Assembly |
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