I highly doubt it has anything to do with the sear or timing. The rod sits a little differently on the MicroMag than it does on the stock frames. There is plenty of room back there, and when it isn't sticking, it fires just fine. Gun looks brand new. My OOOLLLLLDDD Mag from way back used to do this to me, I just can't remember what was causing it. I am just going to replace seals and o-rings. The gun looks so nice, I can't see how that would be the problem...but that is about all anyone has to say. It looked like the bolt was stuck forward when I got it, maybe had been stored that way for a while. Possible that the spring is just really compressed and needs to be replaced. (shrug)
Any more ideas?
I have become one of the "Old Paintball Guys" at my field. Not sure if I am sad or proud.