HKfan said:A lot of aftermarket manufacturers stopped making 357 Sig barrels for the full sized USP 40 because the 40S&W USP mags would not feed 357 Sig reliably.
Although in the Compact series such a conversion just requires a drop in barrel and works 100%, the full sized mags do not like 357 Sig for some reason and so will not feed reliably.
Not to burst your bubble, but it may save you some heartache later on.
Ah Sheet, sorry I didn't notice at first you guys were taking about the HK, and they were were using Sig's.



























