The H&K USP-45 is often described as a tank of a gun. I wonder if it could hold up to .45 Super?
I believe so though I cannot, at this moment, recall where I read it. The fullsize Springfield XD will handle it, the Glock 21 and select 1911s. As with many things, it depends on who you ask.
Has anybody asked the manufacturers? What do they say?
The HK USP can handle 46 Super The only modification that I had to do to mine was inreplace the magazine springs, other wise no modification was required