Just for informational purposes...
My dealer had a HDPS barrel, and a GEMTECH UMP can. Didn't work right so he sent it in to GEMTECH, they "adjusted" the barrel to fit. A few months later he was selling it so I took my UMP(factory 45 barrel) by to test fit the can. Didn't fit...
My takeaway from that was that can's latch was out of spec, and instead of fixing it, they cut the barrel to fit an out of spec can.
All that said, If I ever have a some disposable income I'd still get one, and fix the can myself.