I finally bought a CZ Urban Gray SP-01 for my Silencerco Hybrid. I bought some subsonic 9mm rounds and hit the backyard. The first shot sounded like a squirrel fart and I was very pleased. When I attempted to shoot again, nothing happened. Tap, pull, shoot and the beautiful sound of the gaseous squirrel filled my ears. So, will I have to go to a normal 9mm round and give up on the subsonic?