Lug-Lok® Upper Vise Block — AR15 Barrel-Lug Workholding

An advanced AR15 upper receiver vise block engineered to clamp against the strongest part of the rifle — the barrel lugs inside the star chamber — instead of crushing the outer receiver. Precision-machined from aircraft-grade aluminum to fit all Mil-Spec uppers, the Lug-Lok delivers safer, more secure workholding for high-torque tasks.

Features

• Star chamber locking lugs engage the strongest internal geometry of the receiver
• Precision-machined 7075-T6 aircraft-grade aluminum construction
• Two stainless steel vise pins lock the upper at multiple working angles
• Upper Receiver Lock Knob retains Lug-Lok in the barrel lugs under torque
• Alignment flange for fast, repeatable positioning
• Compatible with all Mil-Spec AR15 upper receivers

Engineering Advantage

Traditional clamp-style upper blocks exert inward pressure on the receiver — enough to deform anodized aluminum when applying torque to a barrel nut or flash hider. The Lug-Lok routes that force through the barrel lugs, eliminating crushing and marring while delivering the rotational lockup needed for high-torque operations.

Critical Applications

• Torquing barrel nuts
• Changing flash suppressors and muzzle devices
• Installing handguards
• Mounting Picatinny rail accessories
• Build and customization workflows

Designed For

AR15 builders and gunsmiths who refuse to risk receiver damage during high-torque bench work. The safest and smartest way to lock down an AR15 upper.