Acu-wedge

The Kleen-Bore Acu-Wedge is a synthetic receiver buffer designed for AR-15, M16, and M4 platform rifles. This USA-made component addresses the common issue of upper-to-lower receiver play that develops in AR-pattern firearms, whether from manufacturing tolerances or wear over time. Shooters who demand a tight, rattle-free rifle will find the Acu-Wedge delivers a noticeably more solid feel during handling and firing. It functions by filling the gap between the upper and lower receivers at the rear takedown pin location, creating consistent contact between the two halves.

Installation requires no gunsmithing, special tools, or permanent modifications to your rifle. The Acu-Wedge simply seats underneath the rear takedown pin, where it applies constant pressure to tighten the receiver junction. Beyond eliminating annoying wobble, this buffer serves a functional purpose: it reduces wear on the bolt carrier and cycling components by maintaining proper alignment between the upper and lower assemblies. The synthetic construction provides durability without adding meaningful weight to your bolt carrier group or receiver assembly. For shooters running high round counts through competition or training, this wear reduction translates to extended component life across the parts that matter most.

The Acu-Wedge suits any AR-15 owner who notices slop between their receivers—common in budget builds, well-used duty rifles, and even some factory configurations. Precision shooters benefit from the enhanced stability, while casual shooters appreciate the improved handling feel. At this price point, it represents inexpensive insurance against accelerated wear. Pair it with a quality buffer and lower parts kit components for a complete receiver system that performs as a unified platform rather than two loosely mated halves.