M82 Scope Mount

I have a M82 Scope with the Mount and Mount Base. I was going to remove the scope from the rings to clean everything. I could not loosen the screws, I tried everything, with no luck. I then called Iron Sights, Inc and my local gun smith and they both told me to put some Kano Kroil penetrating oil on the screws, let it set overnight and then try removing the screws. If that didn't work use CRC Freeze Off and that should work.
I then thought about removing the scope rings from the base. I discovered that the screws holding the scope rings to the base had been drilled and a pin was punched into the screw and the base. I believe they pinned the screws to prevent them from moving.
I have another M82 scope and the screws attaching the scope ring to the base are not pinned.
Can anyone tell me why they are pinned in one scope base and not in another, was this common and how do you remove the pins besides drilling? I would also like to know why I cannot remove the screws from the scope rings.
kaydees
kaydees@embarqmail.com

One of the selling points of the G&H mounting system was that you could dismount the scope and remount later without changing the zero. That would be true as long as all the components remained together as first installed, hence the pins to prevent tampering. Most were pinned, but I have seen some that were not. Sometimes the ring screws are staked with a punch, too.