I have 3 factory 1300 magazine caps(plain, stud, front swivel/stud) and 1 Uncle Mike's swivel cap. They all measure 3/4inch deep. My magazine extends from the front of the barrel lug 11/16 inch which would allow 1/16" compression against the lug pushing the barrel into the reciever as you tighten the cap.
Is this a recent purchase?
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