Kuhnhausen's book lists a breech face angle of 89 deg and 8 minutes. An ordnance print that I have has no angle on it.
Does anyone know the correct angle and is it worth modifying a stock GI slide to get the angle and which side would you remove material from, the frame side (bottom) or the eject side (top)?
Can you put a square on your existing one?
I have a Brazilian slide that measures about 90 and an aftermarket that measures about 89 so which is best?
Try the 90 degree first to see if there is a gap. There is less than one degree to measure and that is about 3/4 of an inch. If it is negligible then that is probably OK. This may act only as only relief and should have no impact. Please try the Guru forum for expert advice.