Don't get me wrong, the MDT BR is great. Well built. Feeds awesome. I'm sure it's tits for a PRS match and if I EVER get to friggin' shoot one, it's what I'll carry and likely buy a spare! Also, if you needed to beat somebody to death and you don't have anything else handy, it'll do!
But the little Magpul 5 rounder is what stays in the gun for now. I will admit, that if something pushes up on the mag, it will stop the bolt. Take the pressure off the mag, bolt runs fine (Origin, btw). I'm sure I could file a little plastic out of the way of the lug and cure it, I've just not taken the time. But it's MUCH handier on the bench, or hunting, or using as a single feed sled.
As far as picking up a round and putting it into the chamber, there's been nary a hiccup out of the little plain Jane Magpul.