RE: Scope suggestions
 

I like a fixed low power (2x-2.5x)as your not going to need magnafication for normal shotgun ranges anyway. K.I.S.S. If anybody knows what that means-keep it simple stupid and no I'm not calling anybody stupid-just using the saying. The saddle/side mounts that replace trigger group pins will do ok as long as your barrel is tight in reciever.

RE: Scope suggestions
 

Good point about KISS. If you do go with a variable, remember to always keep the scope on the lowest magnification when you are walking. Only if you have time, do you turn up the power for a more precise aim or trophy judging. 1x or 2x is a good shooting power up to 100 yards or so. That is lever action range generally.