Arisaka Zero Retention Clamp for Spear Light Standard - Precision Mounting Solution

The Arisaka Zero Retention Clamp for Spear Light Standard is a precision handguard mounting solution designed to eliminate zero shift on tactical rifles where handguard flex compromises sight and laser accuracy. If you've noticed your front sight or laser zero drifting when pressure is applied to the handguard during shooting—a common issue on the SIG Sauer MCX Virtus and Spear LT platforms—this clamp directly addresses that problem with a patent-pending design that locks the handguard to the upper receiver with minimal interference to your shooting grip.

The problem it solves is real: standard MCX Virtus and Spear LT handguards are not rigidly secured to the upper receiver, allowing flex that can shift your zero by 5 mils or more when your support hand applies pressure. Worse, the zero doesn't always return to zero once you release pressure. The Arisaka ZRC uses external clamps threaded into a U-bracket that engages the extended upper receiver, securing the handguard across two axes and virtually eliminating that shift. The U-bracket is engineered to avoid contact with the barrel or gas system, preserving your rifle's free-floated barrel characteristics.

Built from 6061-T651 aluminum and finished with Mil-Spec Type III hard coat anodize, this is a no-nonsense American-made component that handles the job without adding bulk or getting in your way. The clamps are contoured thoughtfully to minimize interference when you're gripping the handguard—form follows function. It's the kind of upgrade that matters most to shooters running precision optics or integrated laser systems who can't afford creeping zero drift in the field or on the range.

Key Features

• Patent-pending design that secures handguard to upper receiver on two axes, eliminating zero shift from handguard flex
• Fits SIG Sauer MCX Virtus (5.56 and 300BLK) and Spear LT (5.56, 7.62x39, and 300BLK) platforms
• CNC-machined from 6061-T651 aluminum with Mil-A-8625 Type III hard coat anodize for durability
• U-bracket design avoids barrel and gas system contact, preserving free-floated barrel performance
• Contoured clamps minimize hand interference while gripping the handguard
• Made in the USA

Frequently Asked Questions

What rifle platforms does this clamp fit?

The Arisaka Zero Retention Clamp for Spear Light Standard is designed for the SIG Sauer MCX Virtus (chambered in 5.56 NATO and 300 Blackout) and the Spear LT (chambered in 5.56 NATO, 7.62x39, and 300 Blackout). The MCX Rattler is not currently supported by this model.

How much zero shift will this eliminate?

Standard MCX Virtus and Spear LT handguards can shift zero by 5 mils or more when pressure is applied to the handguard. The Arisaka ZRC greatly reduces or even eliminates this shift by rigidly securing the handguard to the upper receiver across two axes.

Does this clamp affect the free-floated barrel?

No. The U-bracket is designed to engage only the extended upper receiver underneath the handguard and does not make contact with the barrel or gas system, preserving the free-floated barrel characteristics of your rifle.

Is this a handguard replacement or an accessory?

This is a mounting accessory that works with your existing MCX Virtus or Spear LT handguard. It uses external clamps and a U-bracket to lock the handguard in place and reduce flex-related zero shift without replacing the handguard itself.