No.4 Mk1 magazine not seating

[Paul Stud]

Back strap.

https://www.milsurps.com/images/impo...54996d33-1.jpg

Ah yes, I understand what he meant now. I don't know if that will solve my problem. By filing the backstrap as suggested, it would lock into place yes, but at it's current seating against the bottom of the receiver. I better get a picture up so you guys can see, as mine looks pretty different than that one.

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[Thunderbox]

....as mine looks pretty different than that one.

aha...