It is definitely a screw, not a pin. It goes in from the left side. These are often the very devil to get out and have heads well battered in attempts to do so. You may have to use a Dremel tool cutoff wheel to cut a new screwdriver slot, and maybe that will help. The screw is so small that using an easyout is near impossible, as the easyout breaks. You might be able to drill out the screw, but centerpunching it has to be done carefully, and then you have to clean up the hole and the threads. Toughest part is supporting the rifle on the drill press table unless you make a cradle that can be bolted down. If you do drill, drill from each end, don't try to go all the way through.
Jim
P.S. I have seen a couple of those that were very accurate - 1 1/2 inch groups with open sights.
Jim
[This message has been edited by Jim Keenan (edited December 17, 1999).]