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That gritty spring twang you hear every time a standard AR buffer cycles? This is the fix. The JP Silent Captured Spring in 9mm weight is built by JP Enterprises exclusively for Maxim Defense and drops into their CQB stock system in place of a conventional buffer and spring. Instead of a loose spring rattling around inside your buffer tube, everything is captured on a guide rod, which is where that quiet, smooth feel comes from.
The whole point of a captured spring is eliminating the friction and noise you get from a bare spring dragging against the inside of a buffer tube. JP has spent years hand-tuning their action springs to get that near-silent, glass-smooth cycle their rifles are known for, and this Maxim-exclusive version brings that same feel to a pistol-caliber platform. The 9mm tuning matters here, since blowback guns run a different impulse than gas guns, and this assembly is weighted to keep bolt velocity in check on your PCC or 9mm AR build.
Maxim spec'd this one in tungsten and stainless, so you get the mass you want for taming recoil impulse along with the durability to hold up round after round. Owners running suppressed and pistol-caliber setups consistently report smoother cycling, softer recoil, and quieter operation once this is installed, with plenty pairing it to PDW braces and short builds with zero fuss.
One important thing to know: this is made specifically for the Maxim Defense CQB stock system and will not work with standard mil-spec buffer tubes. It also needs a bolt carrier group with an open rear channel so the guide rod can pass into the carrier during cycling. Do not modify a BCG to make it fit, and do not remove the weight from a 9mm carrier. If you're already running a Maxim CQB stock or PDW brace on your 9mm build, this is the upgrade that ties the whole setup together.
No. This assembly is manufactured exclusively for the Maxim Defense CQB stock system and is designed to fit that platform only. It will not drop into a standard carbine or rifle-length mil-spec buffer tube, so you'll want a Maxim CQB stock or PDW brace already on your build.
It requires a bolt carrier group with an open rear channel so the guide rod can pass into the carrier as it cycles. Maxim and JP both advise against modifying a carrier to make it fit and against removing the weight from a 9mm BCG. If your carrier is a solid or proprietary design, check clearance before ordering.
In a standard AR, the action spring rides loose inside the buffer tube and creates that familiar gritty twang when it cycles. A captured spring wraps everything onto a guide rod, which removes the friction and noise for a much quieter, smoother feel. JP is well known for this glass-smooth cycling in their rifles.
Yes. The tungsten weighting is tuned to manage bolt velocity on pistol-caliber and blowback setups, which owners report translates to softer recoil and calmer cycling. Folks running PDW braces and suppressed short builds have paired it with good results.
| UPC | 680017475727 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MXM47572 |
| Model | |
| Product Type | Capture Spring |
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