The ETS pistol mag is constructed of an extreme impact resistance advanced polymer with superior heat, cold and UV resistance, translucent body, and is creep resistant which means the feed lips and body won't spread when being stored long term even when fully loaded. This mag features an easy disassembly with ETS's specially designed base plate and is also designed to be compatible with Glock extensions. The ergonomically designed floor plate makes it easy to grab from mag pouches. This model does not fit the single stack S&W M&P Shield.