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The CMMG 55CA977 is the buffer your carbine-configured AR-15 or M4 was built to run. It rides inside a carbine-length receiver extension, working hand in hand with your action spring to slow the bolt carrier group on its way back and shove it home again. That back and forth is what keeps the rifle feeding, extracting, and locking up round after round. This is the standard carbine weight, right around 3 ounces, which is the baseline most complete lowers ship with and the spec a carbine-length gas system was tuned for from the factory.
Think of the buffer as the counterweight to your gas system. When the rifle fires, gas drives the carrier rearward into the buffer and spring, and the buffer's mass helps meter that energy so the action doesn't cycle too violently. Get the weight right and you get smooth, reliable function with manageable recoil. CMMG cut this one to mil-spec, so it drops straight into any standard M4 or carbine buffer tube without fuss. It's the same buffer CMMG uses in their own 6-position M4 stock kits, which tells you plenty about how much they trust it.
This is your go-to for a 16-inch carbine-gas build running a full-mass M16-profile carrier, which is the reliable standard. If your rifle is over-gassed or you're running a suppressor or a shorter barrel, you might eventually want to step up to an H, H2, or heavier buffer, but for a bone-stock carbine setup this is exactly what belongs in the tube.
CMMG has been machining AR-15 parts for a long time, and this buffer carries that reputation. The easy-clean silver finish wipes down fast after a dirty range day, and the precisely set weight means consistent cycling for the long haul, whether it's a range toy or a rifle you'd stake something on. Swapping one takes no special tools, so keeping a spare on hand is cheap insurance against a rifle that's down when you'd rather be shooting.
It fits AR-15 and M4-pattern rifles running a carbine-length (M4) receiver extension. It's a mil-spec part, so it drops into any standard carbine buffer tube. Just confirm you have a carbine tube and not a rifle-length one before ordering, since those take a different buffer entirely.
It's a standard carbine buffer, which lands right around 3 ounces. That's the baseline weight most factory carbines ship with and what a carbine-length gas system is tuned around. If your rifle is over-gassed or suppressed, you may eventually want a heavier H, H2, or H3 buffer instead.
Yes. CMMG notes this buffer is meant to run with a carbine action spring inside a carbine or M4-length buffer tube. The buffer and spring work as a pair to cycle the bolt carrier, so make sure both are the correct carbine length for reliable function.
Not at all. Swapping a buffer takes no special tools. Clear the rifle, depress the buffer retainer detent, and the old buffer and spring slide out so you can drop the new one in. It's one of the easiest jobs on the AR platform.
| UPC | 815835013497 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 55CA977 |
| Color | Black |
| Product Type | Buffer |
| Shipping Weight | 0.195 |
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