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Anyone who runs a laser or folding front sight on the handguard of a Sig MCX Virtus or Spear LT has probably run into the same frustration: lean into a barricade, load the bipod, or grip down hard with your support hand and your zero drifts. That comes from the factory handguard not being locked down tight to the upper receiver. Arisaka built the Zero Retention Clamp specifically to solve that, and it does the job without messing with the free-floated barrel.
The ZRC uses a set of exterior clamps that thread into a special U-bracket, and that bracket engages the extended upper receiver underneath the handguard. The result is a handguard that is pinned tight to the upper across two axes, which is where the play was coming from in the first place. Because the U-bracket never contacts the barrel or gas system, your rifle stays free-floated the way Sig intended. The clamps themselves are contoured so they stay out of the way of your hands when you are gripping the handguard.
This version covers the MCX Virtus in 5.56 and 300 BLK, plus the Spear LT in 5.56, 7.62×39, and 300 BLK across the supported gas systems and barrel lengths. The Rattler and Canebrake are not supported, so make sure your handguard slot layout matches before ordering. Worth knowing up front: the clamps occupy the M-LOK slots in that lower position, so plan any accessory placement around them.
The clamps and U-bracket are CNC machined from 6061-T651 aluminum and finished in MIL-A-8625 Type III hard coat black anodize, so it holds up to real use. The whole setup weighs about an ounce, installs with the included hardware, and is made in the USA. It is a simple, patent-backed upgrade that pays off the moment you shoot from any supported position and watch your point of impact stay honest.
This version fits the MCX Virtus chambered in 5.56 and 300 BLK, and the Spear LT chambered in 5.56, 7.62×39, and 300 BLK across the supported gas systems and barrel lengths. It does not support the Rattler or Canebrake. Before ordering, compare your handguard slot configuration against the manufacturer photos to confirm the match.
No. The U-bracket engages the extended upper receiver underneath the handguard and never touches the barrel or gas system, so your rifle stays free-floated. It only secures the handguard to the upper, which is where the flex and zero shift were coming from.
The factory handguard on these rifles is not locked tight to the upper receiver, so pressure from a barricade or your support hand can flex it and move your laser or front sight zero. The ZRC clamps thread into a U-bracket that pins the handguard to the upper across two axes, which greatly reduces or even eliminates that movement. Your point of impact stays consistent even under load.
The clamps are contoured to keep interference with your hands to a minimum while you grip the handguard. Keep in mind they occupy the M-LOK slots in that lower position, so plan any lights or accessories around them. One thing to remember for maintenance: the ZRC must be uninstalled before you remove the handguard from the rifle.
| UPC | 850036188575 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | ZRC-SPEAR-LT |
| Color | Black |
| Product Type | Part |
| Model |
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