I have feeding issues with my 14rd factory mags. Just got my MecGar mags today and not only are the springs thicker, but the spacing is out to the mag body up to the 'pinch' which probably makes it even more stout.
Stock spring is .045"
MecGar is .051".
I will head to the range today and see if my RF and LRN bullet designs feed flawlessly like they do with the 16rd MecGar I have.
And yes, my new P01 is amazing. I would have bought one after trying a friend's back in 2003, but the flat metal mag plate dug into my little finger. The rubber pad solved all that and actually feels better than my 75bd I sold.