MCX Zero Retention Clamp 5.56 and 300BLK

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Arisaka MCX Zero Retention Clamp 5.56 and 300BLK


Installation Guide

The Patent Pending Arisaka Zero Retention Clamp (ZRC) greatly reduces zero shift for lasers and iron sights that are mounted on the handguard of the MCX Virtus and Spear LT. This version is designed for the MCX Virtus and Spear LT chambered in 300BLK or 5.56mm.

The Rattler is not currently supported.

The MCX Virtus and Spear LT handguards are not adequately secured to the upper receiver. This allows the handguard to flex significantly, causing a laser or front sight zero to change when minor pressure is applied to the handguard. A shift of 5 mils or more is possible by pushing on the handguard with your support hand while the rifle is shouldered. Additionally, the zero does not always return to it's original position once pressure is removed from the handguard.

The Arisaka ZRC consists of exterior clamps that thread into a special U-bracket. The U-bracket engages the extended upper receiver underneath the handguard. This secures the handguard tightly to the upper receiver across two axis, greatly reducing or even eliminating zero shift. The U-bracket does not touch the barrel or gas system, preserving the free-floated barrel.

The ZRC clamps are contoured to provide minimal interference with the user's hands while gripping the handguard.

Installation notes:

1. Torque spec: 15 inch lbs with Loctite 222 or 243. While we recommend using a calibrated torque wrench, approximately 15 inch lbs of torque can be achieved by inserting the long end of the included Torx L-key into the screw head and holding the short end in your fingers, then tightening firmly. Exceeding 15 inch lbs risks stripping the screw head and/or damaging the handguard. Arisaka is not responsible for any damage caused by improper installation.

2. The ZRC must be uninstalled before removing the handguard from the rifle.

Installation Guide

Weight: 1 oz.

The ZRC clamps and U-bracket are CNC machined from 6061-T651 aluminum and MIL-A-8625 Type III hard coat anodized.

Made in the USA.