Had a similar experience last week! But with a flat head screws, that were stubborn enough to twist the head on my screw bit, but not completely stuff the head of the screw.
Took it to the gunsmith. He took the action out of the stock (avoiding heat damage to the stock), then heated the screws with a pretty precise blow torch, which loosens (breaks down) the locktite. He gave the driver a bit or persuasion with a mallet.. while repeating this process on the more stubborn screws.
Some numpty used red locktite on the pic rail...
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