The ETS group mags have them beat by a round and they are clear so you can see how many rounds are loaded.
Regardless, still not switching from 17+extension
Unfortunately the lesson to be learned here is that 50% of the country will be voting next year with the mentality of a 9 year old, simply "because a woman is running, yay!"
Havent ever used one but the Hexmag guys did an interview for the 3gunShow last week, and the gist of it was that they had a fallout with Magpul and thought AR magazines were an ideal accessory to enter the market with, and the Hexmag is supposed to be better looking or something.
Personally I...
Keep the 21 inch barrel. It never hurts to have options. That being said, I'll go against the grain and say 24" is optimal, because you know thats what I use and all.