I got a 19 rounder the other day for my K2P, I gotta say, I love the bit of extension on the bottom of the mag. I've got pretty long fingers, and its quite comfortable that way. I gotta say, I was a bit dubious with the SAR brand, as I'd never really heard much about them, but after shooting a friends B6B, I really liked the overall fit and feel of the weapon, I went with the K2P only because I found it second hand for a fair bit under retail, and the gun didn't look to have any real wear on it (no holster wear, and the barrel looked like new). I've probably put close to 1-200 rounds through it at the range, getting it sighted in, and getting used to the trigger, and I'm quite happy.