Hello Mossyrock!
The only "conversion" that was needed was a Bar-Sto barrel,
that Irv III cut an "o-ring groove" like the Expert and Socom
guns have(I supplied the green o-ring, automotive a/c r-134),
then I had Novak's fit it correctly and crown the barrel.
They also polished the ramp and chamber, and "loosened" up
the rifling a wee bit(mostly hand lapping). I did have the
trigger, reliability and Trijicons done by Actions By T-an
incredible job, because I wouldn't have bothered converting
it as crappy as the stock trigger was. And in case anyone
"beefs", I have a lot of ammo thru this gun, whether it be
.40 Super(mostly), .45 Super(tactical loads-just stronger
brass, Texas Ammunition states that it is OK in modern .45's)
or +P .45 ACP loads. Matter of fact, I don't think I've ever
put a "standard" .45 ACP load thru this gun!!!I don't really
care to argue who shoots the most, who's got what, who's
pecker is bigger, etc...maybe I just got lucky and have a
really good USP?! What they call in the auto industry, a
wednesday car!!!