You can buy translucent 30 rd Lancers at PSA for $18.99 and they are better than any 100% polymer mag including the Pmags. I recently sold off all my Pmags from 3-gun in favor of Lancers after testing them out. The metal feed lips means you don't have to keep the dust cover on them when loaded like the Pmags because the polymer feed lips tend to spread if left loaded without the dust covers.
only issue I have with lancers is how their translucent polymer handles UV rays and heat and cold cycles. I have a feeling there is polycarbonite involved.