I keep toying with the idea of using a USP for USPSA. I've got a number of 16-round mags and a jet funnel. However, that is still somewhat limiting, when I've got other guns that hold 20 rounds in a 140 mm mag for that sport. Some have said they had shoehorned various aftermarket Glock basepads on the HK mags with some success.
I'd read here previously that Bruce Gray had been converting STI mags to work in the USP. I tried one of my STI .38 Super mags, and it fit just fine. If I wanted to convert a mag, would it be as simple as taking an STI .40 mag and cutting a catch in the appropriate place? Other than typical mag tuning, is there anything specific to converting one of these to work in a USP?
I'd read here previously that Bruce Gray had been converting STI mags to work in the USP. I tried one of my STI .38 Super mags, and it fit just fine. If I wanted to convert a mag, would it be as simple as taking an STI .40 mag and cutting a catch in the appropriate place? Other than typical mag tuning, is there anything specific to converting one of these to work in a USP?