This works great!. I bought 2, for my m-16 and it is awesome. I play field, so i run a lot and this is great if you don't want to carry a bulky vest. If you have a non-retractable stock on your m16/m4 you can put 2 of these on it (it's kind of tricky, but worth the time). I never run out of ammo with my 3 450 capacity magazines. Overall, great purchase!
Holds mostly all m-16/m-4 magazines.
Fits on ALL m-4/m-16's
Gives your gun a Bad A$$ look.
Doesn't fit my AK-47 magazines, but fits on my AK.
Kind of heavy with 2 of these on my M-16 (All metal magazines).
It wobbles if it's not tightened when I'm running, but is easily fixed.
Don't let the Cons fool you, this is a great purchase.