I had a couple of AEG scopes when I bought a couple of rifles, 4X40 IIRC, On my springer I had a3-9X40, but rarely went above 4X.
My current rifles have an AEG 3-9X40 with mil-dot and the CO2 has a 3-9X50 but I leave it at 3X as I am only working at ranges of about 35mtrs for taking out my rabbits for the pot, even standing.
Unfortunately more rifles only come without "iron" sights these days, but I did manage to source some for adding later.
I also have a BSA Meteor with a 4X32 scope, which is good at 25mtrs.
If you are hoping to take a rabbit at 40mtrs with a spring rifle I would advise a scope as the shot placement is going to need to be good, so a 4X32 would suffice.
My current rifles have an AEG 3-9X40 with mil-dot and the CO2 has a 3-9X50 but I leave it at 3X as I am only working at ranges of about 35mtrs for taking out my rabbits for the pot, even standing.
Unfortunately more rifles only come without "iron" sights these days, but I did manage to source some for adding later.
I also have a BSA Meteor with a 4X32 scope, which is good at 25mtrs.
If you are hoping to take a rabbit at 40mtrs with a spring rifle I would advise a scope as the shot placement is going to need to be good, so a 4X32 would suffice.