I have one, I think it is the older one as it fits stiff, and if I put 10 rounds in it, it will not lock unless I open the bolt first, but it never jams.
It is very handy, I will say that. My idea is to carry the 10 in the gun, and a 20 round Ruger mag in a Blade-tech belt holster (yep, they make one for 20 round 5.56 mags, and it works perfect).
Deaf