I have an early Springfield 1903 that I am trying to remove the receiver sight from. Tried Kroil, several soaks, heated with propane torch and Kroil soak again. Still the screws will not budge, looking for suggestions as to what to use as far as a penetrationg oil. I plan to try a hand impact driver after soaking some more with whatever is suggested.
I assume the screw holes are drilled all the way through the receiver. Remove the bolt and fill the holes with Kroil and let it soak down into the holes overnight.
If Kroil doesn't get them loose, no other oil will either. It'll be time to try mechanical means to loosen the screws.
Best of luck.
