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Anyone who has run a Maxim Defense CQB stock knows the platform earns its reputation for being compact and tough. This standard-weight JP Silent Captured Spring is built to match that same energy, replacing the old-school buffer and spring with a self-contained guide rod and captured spring that lives inside your CQB stock system. It's a JP Rifles design made exclusively for Maxim, so the fit and function are dialed in for their CQB Series rather than being a one-size-fits-all part.
The headline benefit is what you don't hear anymore. A standard AR buffer spring makes that grating "spoon over a cheese grater" sound and vibration every time the bolt cycles. This captured system runs the spring on a guide rod so it never scrapes the inside of your buffer tube, which quiets things down and smooths out the whole cycling feel. Plenty of folks describe the recoil impulse as more refined, almost like a bolt gun, especially when paired with a tuned gas system and a lighter carrier. Noise reduction is the near-universal win, and the smoother action is the reason people who try one tend to buy a few more.
This is the standard, or carbine, weight version and it's built from stainless steel and tungsten for corrosion resistance and a long service life. One thing to know up front: your bolt carrier group needs an open rear channel so the guide rod can pass through during firing. The manufacturer is clear that you should not modify a BCG to make it fit, and this system is not recommended for select-fire use. If you're running a compatible BCG in your CQB stock, installation is about as painless as AR upgrades get since the captured design drops right in.
For a short-barreled or pistol-length build where you want quieter, glassier cycling, this is one of the cleaner upgrades you can make to a Maxim CQB setup.
This unit is built exclusively for the Maxim Defense CQB Stock System and CQB Series, so it's designed specifically to work inside those setups. It replaces the traditional buffer and spring in that platform. It is not a universal AR buffer, so pair it with a Maxim CQB stock for correct fit and function.
Yes. The guide rod needs to pass through an open rear channel in your BCG during firing, so your carrier has to have that clearance. Maxim and JP are clear that you should not modify a BCG to make it compatible; instead run a carrier already built for it.
The most consistent benefit people report is quieter operation, since the captured spring eliminates the metallic twang and vibration of a standard buffer setup. Many also describe a smoother, more refined recoil impulse, though how much recoil difference you feel can depend on your gas system, carrier weight, and load. Either way, the smoother, glassier cycling feel is the reason this system has such a loyal following.
This is the standard, or carbine, weight configuration. The JP captured spring design uses interchangeable steel and tungsten weights, so the system is tunable if you decide you want a heavier setup down the road. That flexibility lets you fine-tune cycling to match your specific build.
| UPC | 685239761184 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 680017475703 |
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