I ordered a .5x36 Osprey piston from Silencerco since I read that 9mm carbines/pistols use that thread and had been unsuccessful trying a .5x28. The thing won't thread on there, won't even start. Been careful not to mess up the threads. Really want to play with my new Osprey 45 (use for 9mm/45acp) I guess I could take it out to Tornado Tech and have a thread pro look it over. Any tricks? I oiled it up and tried that also and it doesn't want to thread on there. Different size piston options are nice, but at $80 a pop I'd like the damn things to work.