Was shooting M&P shield with silencerco barrel, speer 147 tmj, through an optimus. I say I got off about 50 rounds before a round got locked in with the slide about 1/8 of an inch out of battery. I removed the barrel and notice the bullet no longer completely fits in. Trying to figure out if it was too much pressure or if I had a bad round? Either way, I think the barrel is trashed.