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 dud but check the other things first. From the photo of the stock one pressure lug looks a little frayed may just be the light though.
To test the scope without removal a box test both by dialling and shooting a few should suffice.
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