Yes, I think you're correct. It was my next thing to try but frankly it showed that characteristic when everything was brand spankin' new with round #1. This time the gun was absolutely filthy from shooting with can attached and the mags are visibly dirty. What do you use for a brush that won't harm the magazine? I was going to wait for a used toothbrush. I couldn't think of anything else. OK, cleaning gun... I had brush on my mind. Maybe q-tips and soap and water will work.You may be suffering with magazine friction issues. A mag that has 200 rounds through it without cleaning is going to be dry and coated with carbon around the feed lips.