I picked up a top eject post-'64 Winchester 94 with a side saddle style scope mount. I'm going to pull the mount and use a rear peep sight, but I know the side mounts replace one of the necessary receiver screws. Just wanted to make sure, but isn't it the finger lever pin stop screw?

http://www.amazon.com/Orig-Winchester-Post-64-Finger-Lever/dp/B004UB5M9O

Read the first customer review of the screw, same situation as yours apparently.

"I'm not old or Blind..."

Arrogant young whippersnapper...