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A)he may not have another scope to swap, b) it means the donor would need resighting as banging them back on rarely seems to be perfect.
Vortex like all scopes, loopy included do occasionally make a...

Wot he said, start with the simple things and tick them off one by one.
Have the shop recheck all the screw tensions. The scope mount and ring screws should imo be blue loktited to prevent vibrating...