UTG Leapers 30-round AR mag
UTG is trying hard to be a player in the AR components market. Who knows - maybe they'll succeed. Their AR mags are somewhat under the radar, what with Magpul, Lancer, etc. widely available. The standard mags are made in Michigan while the windowed version (of a somewhat different design) is apparently made in Taiwan. The floor plate is patented on their mags. Looking at the patent drawings, what is so particularly innovative about it?
https://www.freepatentsonline.com/D849178.pdf