Cleaned and greased the ps90 and I took it out to the range for the first time today and I'm lucky to get more than 1 shot off in a row working. Most cartridges that wouldn't fire have a mark on the side and there is no mark on the back. It's FN SS198LF ammo , so I would think the FNH ps90 would work fine with it. It seems like maybe taking the hammer pack out and back in would allow the gun to fire again for 1-2 shots. Also I'm not sure if it's related but one of the times i took the gun apart to try to find an issue, the bolt didn't want to come out and it probably took like 10 minutes to come out, despite it usually just sliding out. Seeming to get caught on something half way from the back. To get it out I had to put the barrel back in and use the charging handle and then take the barrel out and then the bolt would come right out. I've also tried firing with 2 different mags (one the factory mag) and had the same issue with both.