Hello,
I would like to buy a new red dot for my MP5 which already had a mount when it was purchased used. Could someone identify what type of rails this mount has since I would like to know what can and cannot be attached to it. There are some writing on the side that says 'Tokyo Marui 94131 - Japan MP5/G-3'. I don't know much about rails and mount and I would hate to buy a red dot to find out it isn't compatible.

Thank you.