Couldn't haver said it better. Both posts above are 100% correct - it just takes both of them to get the whole story! You would think that an air rifle scope would be "bottom of the line" - not the case at all. A spring piston air rifle "hits" a scope in both directions - not just in recoil, and the "hit", although quite small in amplitude, is very sharp. Froghair is correct - if it is listed for an air rifle, your .45-70 won't hurt it. Also, air rifle scopes need to be adjustable for parallax down to "usual" air rifle target distances.