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Anyone who has run a Maxim Defense CQB stock knows the twangy spring noise that comes with a traditional buffer setup. This JP Silent Captured Spring System takes that whole assembly and replaces it with a sealed guide rod and captured spring, so the spring never rubs against the buffer tube walls. The result is quieter cycling, less friction, and a recoil impulse that stays consistent from one shot to the next. It's built by JP Enterprises exclusively for Maxim Defense, so the fit inside the CQB series stocks and braces is dialed in from the factory.
This is the Heavy configuration, which uses two internal weights to reach a 4.0 oz equivalent buffer weight. That extra mass is the whole point. If your gun is running fast because it's over-gassed or wearing a can, the added weight slows down bolt carrier velocity and calms the action down. Folks running suppressed 300 Blackout and short-barreled 5.56 builds tend to gravitate toward this heavier setup for exactly that reason, since it helps keep the bolt carrier from cycling too aggressively.
There's one hard requirement worth knowing up front. Your bolt carrier group needs an open rear channel so the guide rod can pass through during firing. A standard closed-back BCG won't work, and you should never modify a carrier to force compatibility. If you don't already have a compatible carrier, JP Enterprises offers one that's built for this system. This spring is designed for the Maxim CQB stock system only, and JP doesn't recommend it for select-fire use.
The appeal here is refinement. You get a smoother, quieter, more repeatable action without adding bulk or changing the footprint of your compact build. Made in the USA, it's a straightforward upgrade for anyone who already trusts the Maxim CQB platform and wants to tune out spring noise while gaining a little more control over recoil.
No. It requires a bolt carrier group with an open rear channel so the guide rod can pass through during firing. A standard closed-back carrier won't clear the rod, and you should never modify a BCG to force it to fit. If you need one, JP Enterprises sells a compatible carrier.
The Heavy version uses two internal weights for a 4.0 oz equivalent buffer weight, while the Standard runs lighter at around 3.3 oz equivalent. The extra mass in the Heavy setup slows bolt carrier velocity, which helps on over-gassed or suppressed builds that tend to cycle too fast.
It's built exclusively for the Maxim Defense CQB series stocks and braces and won't fit a standard carbine or rifle buffer tube. The dimensions are matched to the CQB system specifically, so plan on running it only inside that platform.
A captured spring keeps the spring sealed inside a guide rod assembly, so it never scrapes against the buffer tube walls. That cuts out the metallic twang and friction you get from a conventional setup, giving you a smoother, quieter, and more consistent recoil impulse shot to shot.
| UPC | 685239761191 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 680017475710 |
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