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The Armaspec Sound Mitigation Buffer SMB-9 Gen3 tackles one of the most annoying quirks of the AR platform: that metallic twang from the buffer spring dragging against the inside of the buffer tube. This captured, single-stage unit rides on a polymer base guide rod, which keeps the spring from ever touching that inner wall. The result is a noticeably smoother, quieter cycle every time the action moves. It's a genuine drop-in swap that replaces your standard buffer and spring, and most folks have it installed in just a few minutes without any special tools.
This version is tuned specifically for 9mm AR carbines and pistols, with a complete assembly that comes in on the heavier side to match the blowback action of a pistol-caliber gun. It's a bit longer than a typical buffer too, which helps it play nice with bolt catches on 9mm setups. One thing worth knowing before you order: the SMB-9 is built for 9mm bolt carriers only, and for proper function you'll want the extra weight removed from the back of the carrier.
Adjustability is a big part of the appeal here. The main spring can be trimmed at roughly a quarter pound per coil to fine-tune tension, up to a maximum of 12 coils, so you can tailor the feel to your load and your gun. Keep in mind the spring fully sets after about 100 rounds, so give it a break-in before you make any final adjustments. Installation is straightforward: drop the polymer base with guide rod into the tube, slide the spring onto the rod, then seat the buffer over the spring.
Armaspec builds these in the USA and stands behind them with a lifetime warranty against defects in material and workmanship. For anyone chasing a quieter, better-feeling 9mm AR without breaking the bank on a full rebuild, the Gen3 SMB is one of the easiest upgrades you can bolt on.
It's designed for 9mm bolt carriers only, so it won't work with rifle or standard carbine carriers. For proper function you'll also need to remove the extra weight from the back of the bolt carrier. As with any pistol-caliber part, confirm compatibility with your specific carrier and setup before running it hard.
The buffer rides on a polymer base guide rod that keeps the spring off the inner wall of the buffer tube. That contact is what causes the familiar metallic "sproing" you hear on a standard AR. Take it away and the action cycles noticeably smoother and quieter.
Yes. The main spring can be trimmed at about a quarter pound per coil, up to a maximum of 12 coils, letting you fine-tune the tension to your load and gun. Just remember the spring fully sets after roughly 100 rounds, so run it a bit before making final cuts.
It is. You drop the polymer base with guide rod into the buffer tube, slide the spring onto the rod, then seat the buffer over the spring. Most people have it installed in just a few minutes with no special tools.
| UPC | 810048492473 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | ARM258-9 |
| Length | 11 |
| Color | Black |
| Model | |
| Product Type | Buffer |
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