Arisaka Defense Zero Retention Clamp — Spear LT/MCX

Description

The Arisaka Zero Retention Clamp (ZRC) is a clamp-and-U-bracket system that reduces or eliminates zero shift for lasers and iron sights mounted on the handguard of compatible rifles. It addresses movement between the handguard and upper receiver by securing the handguard across two axes while preserving the rifle’s free-floated barrel. This version is intended for use with the MCX Virtus and the Spear LT in the chamberings specified by the manufacturer. The Rattler variant is not currently supported.

Key Specifications

• This product is the MCX Zero Retention Clamp.
• Designed to fit Sig MCX platforms.
• Compatible with the MCX Virtus chambered in 5.56 and 300BLK.
• Compatible with the Spear LT chambered in 5.56, 7.62×39, and 300BLK.
• The exterior finish is Black.
• The surface treatment is Anodized.
• Functionally it reduces zero shift for lasers and iron sights mounted on the handguard.
• The system secures the handguard using exterior clamps and a U-bracket that engages the extended upper receiver.

Engineered to stabilize sighting devices without contacting the barrel or gas system, the Arisaka ZRC is a practical upgrade for shooters who require consistent sight alignment from their MCX Virtus or Spear LT platforms. Its low-profile clamps minimize interference with hand placement while the U-bracket maintains the free-floated barrel, offering a durable solution for reducing unwanted zero shift in field and range use.