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After market HK45 High cap Mags?

2630 Views 5 Replies 5 Participants Last post by  Wolvee
I have hunted high and low to no avail, the best I have found is Promag 20rd for the USP. My question is will a USP mag work in a HK45 or am I S.O.L. And dreaming of high capacity?
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