The Otis Technologies Pro+ AR-15 Lock Block (part no. FG-ARLB) holds an AR15 upper steady in a standard bench vise while you remove or install a barrel, muzzle device, gas block, or handguard. Otis Technologies designs it to grip the barrel extension directly rather than the upper receiver, so torque goes into the steel extension instead of the aluminum upper.

Key Specifications

• Locks into the barrel extension rather than the aluminum upper, so torque loads the steel extension instead of the receiver.
• Built with a bronze bushing that accommodates slightly smaller internal receiver dimensions across different AR15 makers.
• Machined from 1018 steel for the durability a barrel-nut job demands.
• Finished in manganese phosphate, a wear- and corrosion-resistant coating common on gunsmithing tools.
• Designed to fit mil-spec AR15 receivers, covering most standard builds.
• Holds in a standard bench vise, so it works with tools you likely already own.

Frequently Asked Questions

Does this clamp onto the upper receiver itself? No, it locks into the barrel extension, keeping torque off the aluminum upper.

What jobs is this block used for? Removing and installing barrels, muzzle devices, gas blocks, and handguards.

Buy the Otis Technologies Pro+ AR-15 Lock Block

Order this AR-15 lock block from Otis Technologies. Ships fast from a Lubbock, TX gun shop. Browse our full gunsmithing tools selection for more build and repair gear.