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The Armaspec Sound Mitigation Buffer (SMB) Gen3 tackles one of the most annoying quirks of the AR-10 platform: that metallic spring twang and rough cycling you feel every time the action moves. This is a captured, single-stage system that swaps in for your factory buffer and spring, and the whole design centers on keeping the recoil spring from scraping against the inner wall of the buffer tube. The result is a smoother, quieter shooting experience that a lot of folks notice the very first time they run a mag through it.
Because the spring is captured and rides on a polymer base guide rod, you get consistent operation without the sproing and rattle a bra standard setup produces. The complete system weighs 7.2 oz, which behaves like a 4.7 oz buffer in use, and that combination helps tame the sharper recoil impulse of .308 and 6.5 Creedmoor rifles. Less felt recoil means the rifle settles back on target faster, so your follow-up shots come easier.
One of the nicer touches here is that the main spring is adjustable. You can trim it at roughly a quarter pound of tension per coil to dial in the feel for your particular build, up to a maximum of 12 coils. That flexibility is handy if you're running an adjustable gas block or a lighter carrier and want the timing just right. Just go slow, since you can always cut more but you can't put coils back.
Installation is about as simple as it gets. Drop the polymer base and guide rod into the buffer tube, slide the spring onto the rod, then seat the buffer over the spring. No gunsmithing, no permanent changes to your rifle. It's made in the USA and carries Armaspec's lifetime warranty, so it's built to stay in your rifle for the long haul. For anyone building or upgrading a large-frame AR, it's a straightforward way to make the gun feel more refined without touching the barrel or gas system.
This version is built specifically for AR-10, .308, and 6.5 Creedmoor rifles and drops into a standard rifle-length buffer tube. It replaces your factory buffer and spring with no modifications to the rifle. If you have an AR-15, Armaspec makes a separate SMB in several AR-15 weight options.
The captured spring rides on a guide rod so it never scrapes the buffer tube wall, which cuts out most of the metallic twang and rattle you hear on a stock setup. Shooters running .308 and 6.5 Creedmoor rifles report a noticeably softer recoil impulse and faster return to target. It won't turn a big-bore AR into a rimfire, but the difference in feel and sound is easy to notice.
Yes. The main spring is adjustable and can be trimmed at about a quarter pound of tension per coil, up to a maximum of 12 coils. This lets you fine-tune the feel for your gas system and carrier. Cut in small steps, because once coils are removed you can't add them back.
Not at all. You insert the polymer base and guide rod into the buffer tube, slide the spring onto the rod, then seat the buffer over the spring. It's a tool-free swap that most people finish in a couple of minutes.
| UPC | 810048492480 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | ARM258-AR10 |
| Length | 9.9000 |
| Product Type | Buffer |
| Color | Black |
| Model |
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