STI mags in a USP

[maurice]

ANyone ever heard of this ??? It was mentioned that they might be interchangeable on the HKpro website.....??

 

[capp325]

I'm pretty sure they'd have to be modified. One of the members on HKPro (Michael Vain I believe) converted his USP40 into a 10mm and found that STI mags work for his purposes after some modifications (still, I doubt they're 100% reliable). Unless you're planning to do the same thing, I can't see why you would want to use STI mags.