They should be but that doesn't mean all are.it would seem to me that air rifle scopes are built the toughest….?
Piston air rifles, shot guns and semi auto rifles are very hard on scopes. Muzzle brakes also increase stress on scopes. I called Nikon and asked them about it. They said that their Ninon ProStaff 4x was "solid enough to handle the hardest recoil." I bought a 4x for my M1A and it never failed to keep zero. My Nikon ProStaff 4-9x40 has performed well on a magnum with a brake and an AR.
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