Kak Industry Llc. K-Spec Ar-15 H1 Buffer Tube Kit W/3.8Oz Buffer Black

The Kak Industry K-Spec AR-15 H1 buffer tube kit pairs a 3.8 oz buffer with a complete recoil management system designed to smooth out the impulse and reduce muzzle rise on your rifle. This is a ready-to-install package that handles the three core components most shooters upgrade first: the buffer itself, the spring, and the tube. If you've felt excessive recoil or bolt bounce on a stock setup—or just want a tuned feel that's easier to control on follow-up shots—a dedicated buffer kit is one of the highest-ROI upgrades you can make.

Kak Industry engineered the K-SPEC buffer around a captured compression system that absorbs recoil energy without relying on wear-prone internal parts. The flatwire spring included in this kit works in concert with the H1 buffer weight to optimize the bolt cycling action. All of this is mounted in a carbine-length buffer tube that meets mil-spec standards, so it'll play nice with any standard AR lower receiver and stock combination you're running. The kit also includes the installation tool, so you're not hunting for a wrench or punches.

This is American-made equipment built for durability. The captured design means fewer moving pieces and less to fail over thousands of rounds. Whether you're tuning a 5.56 rifle for precision shooting, taming a heavy hitter, or just building out your first AR, a quality buffer kit removes one of the rougher edges of the platform and makes shooting faster and more comfortable. The H1 weight strikes a balance for general-purpose use—mild enough for standard loads but substantial enough to manage recoil well across the board.

Key Features

• Complete buffer tube assembly kit: includes 3.8 oz H1 buffer, flatwire spring, carbine buffer tube, and installation tool
• Captured compression design reduces bolt bounce and minimizes muzzle rise
• Mil-spec carbine buffer tube compatible with standard AR lower receivers and stocks
• American-manufactured with durable, low-maintenance construction
• No complex internal parts to wear out over time

Specifications

Buffer Weight	3.8 oz (H1)
Buffer Type	K-SPEC captured compression
Spring Type	Flatwire
Buffer Tube	Carbine length, mil-spec
Finish	Black
Country of Origin	USA
Kit Includes	H1 buffer, flatwire spring, carbine buffer tube, installation tool

Frequently Asked Questions

Is this buffer tube kit compatible with my AR-15 lower?

Yes. This kit uses a mil-spec carbine-length buffer tube, which fits any standard AR-15 lower receiver and works with virtually all AR stocks and braces designed for carbine tubes.

What does the H1 buffer weight mean, and is it right for me?

Buffer weight affects how fast the bolt cycles and how much recoil you feel. The H1 (3.8 oz) is a mid-range weight that works well for general shooting with most common AR loads. If you're running lighter loads or a very fast-shooting setup, you might consider a heavier buffer; for heavy magnums or slow-cycling builds, lighter weights may be better. This kit gives you a proven starting point.

What's included in the box?

The kit includes the 3.8 oz H1 buffer, a flatwire spring, the carbine-length buffer tube, and an installation tool—everything you need to assemble and install the system on your lower receiver.

Do I need any special tools to install this?

The kit includes an installation tool for assembly. You'll need a standard AR armorer's wrench or similar tool to attach the buffer tube to your lower receiver if you don't already have one.