"This mag looks good and brings a nice style to the standard STANAG magazine that doesn't mimic MagPul P-mags. Aside from looks, the internals and inner-workings and mechanism of this magazine are not very good. it is plagued with errors and does not preform well. The shell, or sleeve, whatever you want to call it, however, is quite durable and does a good job at protecting what is inside. All in all I would say you should not buy this magazine, and stick with the standard metal STANAG, or go for the DBOYs thermal molded mag."