The clear ones do. The translucent ones tend to be tougher. Not perfect, I agree, but absolute 100% toughness isn't necessarily "mil-spec", or such was the point I was trying to make.The clear beryl mags are also still prone to cracking around the feed lip area due to lack of metal reinforcement. Of course Magpul has tried clear and smoke polymer formulations and deemed them too weak for use.
Also, my translucent Lancers seem pretty damned excellent - albeit with metal feed lips.