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Yes. That sounds like a converted Pam mag.
Does it look like this? I bet the answer is yes.
One other option is to call Jerry Prasser (reconord.com) and tell him that you got the mag at a gun shop and it looks like one of his and you were wondering if he'd replace it with one thats the proper size.
There is a good chance he'll swap it out for you for no charge.
Don
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