HK dumped translucent polymer mags. They worked fine and were durable when made exactly up to spec. But when something went even slightly wrong in production they were too fragile. There just was not enought safety margin. But when I got info that there will be no more translucent mags (at least for military sales) I also got info that HK has replacement in works. Looks like they realized that all this translucent part is overrated.