308 Ar Silent Captured Spring Gen 2 H2 W/ Alt Pack

The JP Enterprises 308 AR Silent Captured Spring Gen 2 H2 with Alternative Pack is a drop-in recoil system engineered to smooth out the mechanical noise and vibration that come standard with AR-platform rifles. Unlike a conventional buffer and spring assembly, this captured-spring design requires no permanent modifications to your rifle—it simply replaces your existing buffer tube setup. The H2 buffer weight (approximately 4.7 oz) pairs a custom-ground, carefully balanced spring with JP's proprietary LMOS buffer to cut friction and vibration dramatically. If you've ever winced at that metallic grinding sound during dry-fire or live fire, you'll appreciate the difference a proper recoil system makes, especially in suppressed setups and short-barreled rifles where felt recoil and noise are already amplified.

The Gen 2 design includes an aluminum guide rod that reduces overall weight without sacrificing dampening performance. The H2 buffer itself houses two tungsten weights plus one steel weight—that extra mass translates to better bolt control and less chance of bounce, which matters if you're running a piston op system, select-fire platform, or a suppressed rifle where reliable function under pressure is non-negotiable. The "Alt Pack" designation tells you this kit includes a spacer that lets you install it in both carbine-length (M4-style) and rifle-length buffer tubes, so whether you're building on an A2 receiver or a modern collapsible stock platform, you're covered.

JP Enterprises engineered this system so the buffer masses correspond across their H1, H2, and H3 lineup, which means future tuning or swaps are straightforward if your build changes. The included auxiliary spring rate kits let you dial in performance for your specific rifle setup—particularly valuable if you don't have an adjustable gas block. This is a serious upgrade for shooters tired of noise, vibration, and reliability hiccups; it's especially recommended for short-barrel and suppressed rifles where standard buffer systems fall short.

Key Features

• Drop-in design with no permanent rifle modifications required
• H2 buffer weight (4.7 oz) with two tungsten and one steel weight for superior dampening
• Custom-ground, balanced spring reduces friction and mechanical noise
• Lightweight aluminum guide rod
• Included spacer fits both carbine-length (M4) and rifle-length buffer tubes
• Auxiliary spring rate kits for custom tuning to individual rifle specifications
• Designed for short-barreled, suppressed, piston-operated, and select-fire platforms

Specifications

Frequently Asked Questions

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

Yes. The 308 AR Silent Captured Spring Gen 2 H2 includes a spacer that allows installation in rifle-length buffer tubes, so it fits both M4-style collapsible stocks and longer fixed rifle-stock configurations.

Is this recommended for suppressed rifles and short-barrel builds?

Absolutely. The H2 buffer weight with tungsten mass is specifically recommended for short-barreled rifles and suppressed firearms, where it helps manage the increased backpressure and recoil these setups generate.

Can I adjust the spring rate if my rifle doesn't function perfectly out of the box?

Yes. The kit includes auxiliary spring rate kits that let you fine-tune the recoil system's performance to your specific rifle. This is especially useful if you don't have an adjustable gas block, since a slightly different spring rate can optimize function for your setup.

What makes this quieter than a standard buffer and spring?

The Gen 2 design combines a custom-ground, balanced spring with JP's LMOS buffer to greatly reduce friction and vibration compared to conventional springs and buffers. The aluminum guide rod and heavier buffer masses (tungsten and steel) work together to absorb recoil energy more smoothly and with less mechanical noise.