Are you trying to fit on a gun or rifle ( you said gun) What model are you asking about,. Is it a scope designed for pellet rifles. How big its the dovetail on the rifle. You need to be more specific.
Which model do you have
S & K Scope Mounts in western PA makes one for the Eddystone http://www.scopemounts.com/ Look under "Insta Mounts"
It has an 11 mm dovetail mount so any 11 mm scope mount will fit
yes
Yes. Any scope or attachment with picatinny rail mounts will fit onto the X7.
Marvel Custom Guns makes a scope base that replaces the sight rib on a Victor and uses Weaver rings.
Your shotgun was manufactured by Hi Standard as their Supermatic model C1200, no later than the early 1980's. Suitable scope base mounts will be difficult to find.
Just about any rings and mounts made by Weaver will fit nicely. Using lesser quality rings will cause the scope to go out of adjustment when the shotgun is fired.
You did not tell us what model Browning you have. There were dozens, if not hundreds, of different models.
Contact Marlin
it will fit but you will have to fabricate new motor mounts and transmission mounts.
Follow the instructions provided with the scope/mount. You need to make sure you have a scope with rings that will fit on a "Dovetail" scope base rail. They have 3 main bases; dovetail- mostly for air and pellet guns...some 22's also, Weaver style, and Piccatini rail systems.