I think the Lancer L7 mags are just starting to really hit the market. Brownells got some of the black translucent 20rd versions in recently. Haven't seen the clear yet anywhere that actually has them instock. I picked up one from Brownells and tried it a bit at the range this past weekend. Didn't put many rounds through it but had zero issues and it seems very sturdy. But yes, they are spendy. Definitely not going to replace the pmags at the current price point. Just kind of a novelty I suppose for those that may want to have 1 or 2.