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The Maxim Defense CQB Buffer and Spring H1 is not your average buffer swap. This one is built to work exclusively inside the Maxim CQB stock and brace system, which uses a shorter, proprietary buffer tube instead of a standard mil-spec extension. That means you can't just drop this into any AR build, but if you're running a Maxim CQB stock or PDW brace, this H1 weight gives you a meaningful step up from the standard buffer that ships with most setups.
At 4 ounces, the H1 buffer adds enough mass to slow bolt carrier velocity down without over-doing it. That translates to less bolt bounce, smoother cycling, and a noticeably softer recoil impulse on guns running mid-length gas systems or barrels in the 11.5 to 16 inch range. It also helps extend dwell time, which is a real benefit if your gun runs a little overgassed or you're shooting suppressed and dealing with extra port pressure.
Because the Maxim CQB buffer tube is shorter than a standard AR15 receiver extension, it needs a buffer and spring matched to that reduced length. This H1 set is engineered from tungsten and stainless steel so it holds up under repeated cycling while keeping the density needed in a shorter footprint. It's a direct drop-in for the CQB system, no modifications, no fitting required.
Getting the buffer weight right on a compact stock system makes a bigger difference than people expect. Too light and you get excess bolt bounce and a snappier recoil pulse. Step up to the H1 and most shooters running a mid-length 11.5 to 16 inch barrel notice calmer cycling and a more controlled shot to shot recovery, particularly once a can gets added to the end of the barrel.
Keep in mind this buffer and spring pairing is meant to be used together. Maxim tunes the spring rate specifically around the buffer weight, so mixing components from other buffer systems isn't recommended and can lead to short-stroking or failure to lock back.
No, this buffer and spring set is built specifically for the shorter Maxim Defense CQB buffer tube used in their stocks and pistol braces. It will not fit or function correctly in a standard mil-spec receiver extension, so make sure your build actually uses the Maxim CQB stock system before ordering.
The standard CQB buffer weighs in around 3.3 ounces while the H1 steps up to 4 ounces. That extra mass slows bolt velocity slightly more, which can smooth out cycling on mid-length gas guns or barrels that run a bit overgassed, especially with a suppressor attached.
This is a matched set, so the buffer and spring both come together in one package. Maxim tunes the spring rate to work with this specific buffer weight, so it's best to keep them paired rather than mixing with springs from another source.
The H1 tends to perform well on guns with mid-length gas systems and barrels roughly in the 11.5 to 16 inch range. If you're running a shorter pistol-length gas system or a 9mm build, you'll likely want a heavier option like the H2, H3, or the pistol caliber buffer instead.
| UPC | 680017475659 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MXM47565 |
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