The Kak Industry K-Spec AR15 A5-length H3 buffer tube kit is a complete recoil management system built for shooters who want smoother cycling and less muzzle rise without overcomplicating their setup. This is an A5-compatible buffer system—longer than standard mil-spec tubes and tuned for rifles running adjustable gas blocks, pistol-length gas systems, or heavy bolt carrier groups. The 6.5oz H3 buffer weight sits in the middle of Kak's lineup, making it a solid choice for balancing recoil reduction with reliability across a wide range of ammunition.
The kit pairs Kak's captured compression K-Spec buffer design with a flatwire spring and everything you need to install it yourself. The captured compression system is the core of Kak's approach: instead of relying on complex internals that wear over time, this design absorbs recoil and dampens vibration through geometry and material science. It's a philosophy that favors durability and simplicity—no exotic parts, no maintenance burden. Whether you're tuning a precision rifle, building a soft-shooting AR, or dialing in an adjustable-gas setup, having the right buffer weight and spring pairing matters, and this kit takes the guesswork out.
Kak Industry manufactures this system in the USA, and the flatwire spring combined with the A5 tube gives you a platform that works across different gas profiles and ammunition loads. The kit includes the buffer, spring, tube, and installation tool, so you're ready to drop it into your lower receiver right away.
| Brand | Kak Industry |
| Buffer Weight | 6.5oz (H3) |
| Tube Type | A5-length |
| Spring Type | Flatwire |
| Finish | Black |
| What's Included | K-Spec H3 buffer, flatwire spring, A5 tube, installation tool |
| Country of Origin | USA |
Buffer weight affects how much recoil energy is absorbed and how quickly the bolt carrier group cycles. The H3 (6.5oz) is heavier than standard H1 or H2 buffers, slowing bolt velocity and reducing felt recoil. It's a good middle-ground choice for shooters running a variety of ammunition or who want gentler recoil impulse without going too heavy.
This A5-length buffer tube is designed to fit any AR15 lower receiver with an A5-compatible buffer tube extension. Before ordering, confirm your receiver is set up for A5 (not standard mil-spec, which is shorter). The kit includes everything needed for installation.
The buffer installation tool is included in this kit to simplify assembly when you drop the buffer, spring, and tube into your lower receiver. It helps you seat all components safely and correctly without damaging parts.
A heavier buffer like the H3 absorbs more recoil energy and can contribute to a smoother, more controllable recoil impulse. However, muzzle rise is also controlled by your rifle's gas system, barrel profile, and whether you're running an adjustable gas block. This kit provides the buffer portion of recoil management; tuning your gas system separately may further improve control.
Kak Industry
Kak Industry
