i fired off a second mag of "tula" crap 44 rounds to start with.
so far no problems. the rounds are nearing the bottom of the mag when you put in 44 rounds. they won't hold any more.
i don't recommend over loading mags but i just couldn't help myself--LOL
they do look a lot like those 50 round mags the DOD kept promising us but never delivered in any numbers.
well for $12-$15 a pop there certainly worth a try.
their height is the same as two 20rd mags on top of each other.
the stainless seems pretty hard and sturdy- they should be durable enough.
the spring is not the shiny stainless spring in the other c-prod mags though. it looks like a carbon steel spring--though it could just be blackened stainless like the mag body.