Put a Carver Custom funnel/magwell on my 5" M&P 2.0
Added +5 baseplates (brass, so heavy) and springs to three mags to try out.
Just got back from the range, and it's on like Donkey Kong. There's been several stages in USPSA league where I wouldn't have had to reload with these mags, and the mag changes are a LOT easier with a freaking funnel on the bottom of your grip.
As an unexpected bonus, the magwell makes for a really consistent grip on the draw.