So, I finally received my backordered full size 40 mags and tried them out on my 40c. After the first shot it would not chamber another round. The mag was becoming unseated after every shot! While trying to work though this it caused no round to be chambered probably 90% of the time. The other 10% was various failure to feed problems cause by the mag dropping. This happened with both magazines. I popped in the standard compact mags and ran through a box with no problems. Has anybody else experienced this? Is sounds like it could be closely related to the mag release problems others are seeing.