Before I bugger up something simple there seems to be some confusion on the exact size of allen wrench to use on the rear sight of a S&W Shield. I would imagine that it would be a proprietary size by Smith but can anyone definitively tell me the correct size please.
And if I understand correctly it will be best to perhaps use a soldering iron to heat the set screw to break the Loctite bond before trying to remove the screw.
Karl