JP Enterprises Silent Captured Recoil Buffer Spring Assembly Gen 2 for AR-10/LR-308

The JP Enterprises Silent Captured Recoil Buffer Spring Assembly Gen 2 for AR-10/LR-308 is a drop-in replacement system designed to smooth out your large-frame AR's cycling while cutting down on the metallic noise that comes with standard buffer springs. Built around JP's custom-ground captured spring and matched buffer, this assembly reduces friction and vibration throughout the recoil cycle—eliminating that harsh "spoon over a cheese grater" rattle you get with conventional setups. The Gen 2 improves on the original with an aluminum guide rod that keeps overall weight in check, while strategically added mass in the buffer itself gives you better, more consistent performance across a wider range of rifle configurations.

Fit and versatility are handled well here. The assembly works with both M4-style collapsible stocks and rifle-length fixed stocks—the included spacer adapts it to either tube length. The standard buffer weighs approximately 3.6 ounces and combines tungsten and steel weights for the right balance of mass and durability. If your rifle needs tuning beyond the default setup, JP offers Auxiliary Spring Rate Kits to dial in performance for your specific configuration, which is especially useful if you don't run an adjustable gas block. The interchangeable buffer design even allows you to swap between AR-15 and AR-10 platforms, giving you flexibility if your collection grows.

Installation is straightforward—no gunsmithing or permanent modifications required. Drop it into your buffer tube, and you're running a quieter, smoother-cycling recoil system that handles the harsh recoil impulse of large-frame rifles with noticeably less noise and felt vibration. For shooters building or upgrading an AR-10 or LR-308 who want reduced recoil signature and cleaner cycling, this is a solid choice.

Key Features

• Custom-ground captured spring paired with JP LMOS buffer reduces noise and vibration
• Aluminum guide rod minimizes assembly weight
• Works with both M4 collapsible and rifle-length fixed stock tubes (spacer included)
• Optimized buffer mass for improved function across diverse rifle builds
• Auxiliary Spring Rate Kits available for tuning to specific rifle configurations
• Interchangeable design allows swapping between AR-10 and AR-15 platforms

Specifications

Frequently Asked Questions

Will this fit my AR-10 with a rifle-length stock?

Yes. The Gen 2 Silent Captured Spring Assembly includes a spacer that allows installation in both carbine-length and rifle-length buffer tubes, so it works with M4 collapsible stocks and longer fixed rifle stocks.

Can I use this if my AR-10 doesn't have an adjustable gas block?

The default spring offers reliable performance across a wide range of configurations, including rifles without adjustable gas blocks. If you want to optimize for your specific setup, JP offers Auxiliary Spring Rate Kits to fine-tune the spring rate for your rifle.

Is installation permanent, or is this a drop-in system?

This is a drop-in system that requires no permanent modifications to your rifle. It simply replaces your existing buffer and spring assembly in the buffer tube.

Can I swap this between AR-10 and AR-15 if I own both platforms?

The interchangeable buffer design allows you to convert between AR-15 and AR-10 models, giving you platform flexibility if you decide to use it across different builds.