Can't you hold the action in a vise?
Thought of that, just think it would look better with the crush washer (no gap between jam nut and barrel)Or buy a jam nut. I think TNA carries 'em.
I'm just scared of all that torque transferring to where the barrel mates with the action. Or is that nothing to worry about?
Muzzle brakes do not require much torque. As a matter of fact, if your installing this brake on a long barreled rifle of say 24+ inches, you really want to be cautious applying to much torque and stressing the barrel or even twisting it ever so slightly. It’s a brake, some folks run them hand tight.
Or buy a jam nut. I think TNA carries 'em.
I missed that. Crush washers aren’t used here, brakes get indexed on machines.
“Impossible” and “No matter how hard” ? If accuracy is important to an individual, you can most definitely twist a barrel so that it’s accuracy fails. Some .30 cal lightweight barrels with OD’s of .600 are very susceptible to deformation. To each their own Guntech, just letting the OP know some possible concerns with over torquing brakes after many years of manufacturing and installing.