I would not use a torch to try to heat a receiver - even if it is only a stub from a deactivated
gun - to be able to remove the barrel. To get the receiver hot enough to do any good would likely
damage the barrel. M1928A1 barrels are easier to "break" than M1/M1A1 barrels. I have mentioned
before that we do a lot of barrel removal and the standard routine for an M1/M1A1 is to clamp the
barrel at its thickest close to the receiver in a hydraulic press using special blocks. Then we have
a BIG adjustable wrench that we fit to the receiver right where the threads are, then we have a
3 foot pipe to slide over the handle of the wrench and even with all of this you really have to use
a lot of force to break the barrel free. You are turning the receiver off the barrel and you can only
turn the receiver maybe 1/8 of a turn before the grip mount hits the blocks. My point being that
some of the barrels can be very tight.
I know that many have their own tricks to do this but it rises beyond the level of a standard
workbench and vise, etc. And while all this is going on you have to flex the grip mount away
from the barrel so you don't scratch the barrel as you unscrew it.