Yes I am serious. I have CZ75 PCR. It was flawless until now. I think it might be the mags. The slide is locking open with rounds still left in the chamber. I am using 15rd mags that I bought from Cdnn. They are factory. I am shooting Wincheste white box 115grain ammo. Do I need new mags? A new slide stop pin? The gun has about 300rds though it.