Last night I received the holster that I ordered from Solely Canadian for my inbound HK VP9. I have to say that I am very impressed with it. Every bit as good (if not actually better quality) as the handful of Raven Concealment holsters that I have. My VP9 has a threaded barrel as well so the bottom of the holster is opened up to accommodate. I'll know for sure when the gun arrives, but it doesn't look like there should be any problems.
A1t first I was a little disappointed that the holster didn't fully cover the extended portion of the barrel like the Raven ones do, but when I compare it to the Raven holster I have for my Walther PPQ (also threaded extended barrel), I appreciate how much more compact the Solely Canadian holster is. There is a lot of extra material on the Raven to make the whole holster tall enough to cover the extended barrel.
I'll definitely buy from Solely Canadian again!