Kak Buff/Sprng Kit Ar15 K-Spec 5.5Oz

The Kak Industry K-Spec 5.5oz Buffer and Spring Kit for AR-15 is a purpose-built recoil management system designed for shooters who want smoother operation without complexity or wear-prone gimmicks. This carbine-length buffer kit pairs a heavier H3-weight buffer with a flatwire spring to reduce bolt bounce, flatten muzzle rise, and tame felt recoil—all with straightforward drop-in installation on your AR platform rifle.

What sets the K-Spec system apart is its captured compression design: instead of loose coils or hydraulic internals that degrade over time, KAK Industry engineered a reliable mechanical solution that absorbs energy consistently, shot after shot, without the maintenance headaches or failure points of more elaborate setups. The 5.5oz weight works well for standard loads and suppressed shooting on carbine tubes, giving you the flexibility to tune your rifle's cycle rate without replacing the whole buffer assembly.

This is American-made hardware built for hunters, sport shooters, and serious AR builders who prioritize durability and simplicity. The kit ships complete with the H3 buffer, flatwire spring, and an install tool—everything you need to get to work. If you're running a carbine-length buffer tube (standard on most modern ARs), this is a no-nonsense upgrade from mil-spec parts.

Key Features

• 5.5oz (H3) K-Spec buffer with captured compression system for reliable recoil absorption
• Flatwire spring included; simple drop-in replacement for mil-spec setups
• Reduces bolt bounce and smooths felt recoil impulse
• No complex hydraulics or wear-prone internals
• Includes buffer installation tool
• Made in America; designed for lifetime use
• Designed for carbine-length buffer tubes

Specifications

Frequently Asked Questions

Will this buffer kit work with my AR-15?

Yes, provided your rifle uses a carbine-length buffer tube. This is the standard tube length on most modern AR-15s. If your build runs a rifle-length or pistol-length tube, this kit will not be compatible.

What's the difference between the 5.5oz H3 and lighter buffer weights?

The 5.5oz H3 is the heaviest option in the K-Spec lineup. A heavier buffer slows bolt carrier velocity, which can help reduce recoil impulse and muzzle rise, and is particularly useful with standard loads or suppressed ammunition on carbine-length systems. Lighter buffers cycle faster and work better with lower-power loads.

Is this a complete kit, or do I need additional parts?

This is a complete kit. It includes the H3 buffer, flatwire spring, and an installation tool. You can install it straight into your carbine tube as a drop-in replacement.

How does the K-Spec captured compression system differ from other recoil buffers?

The K-Spec uses a captured compression design rather than hydraulic fluid or loose coils. This approach eliminates complex internals that wear or fail over time, giving you a simpler, more durable solution that performs consistently without the need for maintenance or replacement of internal components.