During an IDPA match last weekend, my P210 Carry was jamming and we couldn't diagnose it at the time.

Turns out that several of my mags (all with Taylor Freelance's GGI +1 adders) were catching the slide as it sought to move forward into battery. The slide was actually catching on top of the mag; therefore the mags were overinserted.

Anyone else experience anything like this? I'll be calling Gray Guns on Monday to get their take on the issue.

I look forward to your post on what they say the problem is.

First question, did they work properly W/O the plus one mod/s?

I'm having a hard time picturing how the aftermarket extended bases have anything to do with the mags getting "overinserted". If anything, they can only be either under inserted or normal inserted. Did you put the factory bases back and shoot them? And see what happened? I'm thinking the mags themselves being out of specs is the problem here.