I don’t know if you need one you might be strong enough to do it just with the wrench like a normal AR that hasn’t got lock tight in it. I don’t know if they all use the same amount of lock tight on each gun.
but on mine I couldn’t do it without fixing the gun in position. But when you have done it once and broken the lock tight you don’t ever need the vice or blowtorch again. You can just use the wrench on its own after that.