Maxim Defense MXM47571 JP Silent Captured Spring - Heavy Tungsten/Stainless Steel for AR-Platform

The Maxim Defense MXM47571 JP Silent Captured Spring pairs advanced recoil management with the Maxim Defense CQB Stock System to deliver a smooth, controlled shooting experience on AR-platform rifles. Built from heavy tungsten and stainless steel, this captured spring assembly is engineered to reduce felt recoil and keep your rifle stable through rapid fire or extended range sessions. If you're running a short-barreled rifle or CQB setup and want to dial in your recoil impulse, this is the spring system built specifically for that mission.

The captured spring design confines all moving parts within the buffer tube, eliminating the rattle and maintenance hassle of loose components. That means faster, quieter cycling and one less thing to fidget with at the range. The heavy tungsten-stainless construction absorbs energy efficiently, giving you a noticeably softer shoulder impulse compared to standard mil-spec springs.

Important note: This system works exclusively with the Maxim Defense CQB Stock and requires a bolt carrier group (BCG) with an open guide rod channel to function properly. JP Enterprises supplies compatible modified BCGs if you don't already have one. Make sure you've got the right BCG before ordering, or you'll be blocked up.

Key Features

• Heavy tungsten and stainless steel construction for superior recoil absorption
• Captured spring design — confined, quiet, and rattle-free
• Purpose-built for Maxim Defense CQB Stock System compatibility
• Reduces felt recoil and improves control on AR-platform rifles

Specifications

Frequently Asked Questions

What bolt carrier group do I need for this spring?

The Maxim Defense MXM47571 requires a bolt carrier group with an open channel to allow the guide rod to pass during firing. JP Enterprises manufactures compatible modified BCGs for this system. Check with them or your gunsmith to ensure your BCG has the proper channel before installing this spring.

Will this work with my standard AR buffer tube and stock?

No. This spring is designed exclusively for the Maxim Defense CQB Stock System and will not function with standard mil-spec buffer tubes or other aftermarket stocks.

Does this spring reduce recoil?

Yes. The heavy tungsten and stainless steel construction absorbs and dissipates recoil energy more effectively than standard springs, resulting in less felt impulse and improved control during rapid fire.

What makes a captured spring different?

A captured spring design keeps all internal components — spring, rod, and weights — contained within the buffer tube. This eliminates rattle, reduces noise, and removes the need to disassemble and maintain loose parts.