Love the custom work you had done.If you are having ANY issues with your EMP, contact SA and let THEM fix it.
I had no problems with my EMP before or after I had a little custom work done..
I had a similar problem with a 9mm Sig P239.Love the custom work you had done.
My issues happen with the slide open, 9 in the mag, then release the slide,either with the release or by working the slide. If I have 1 in the chamber & 9 in the mag- no problems with any mag. I think only 1 mag is the issue, haven't maked them to find out, next trip to the range I'll mark the mags to see.