My recommendation is to continue to the soaking with penetrating oil. It may take several attempts over a week or more... Use the best fitting screwdriver that you have, and while pressing down to make sure you don't slip out of the slot, use a crescent wrench or vice grip on the blade of the screwdriver to apply the torque...
I wouldn't attempt Hub's suggestion of the use of a torque screwdriver except as a last resort... if you do so, make sure you have a piece of metal exactly the width of the mag well to absorb the shock of the impact on the torque screwdriver or you will very likely bend your frame...
Heating the frame (without burning the metal or the grips) and chilling the screw may very well break the hold... Hopefully the screw slot hasn't been stripped by overtightening... Let us know how you make out...
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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