Yesterday I put 300 rounds through my Gen 4 G19. Today I went to clean my gun and noticed a pin protruding almost completely from the frame. I put the pin back I. It's place but now the trigger feels extremely gritty and creepy. Almost as if the trigger return spring is broken, perhaps? I'll try attaching a picture of which pin came out. Has anyone else ever had this occur? This gun has less than 1500 rounds though it so I'm a little surprised.