Mec-Gar magazine quality is so well known that firearm manufacturers including Remington, Sig Sauer and Walther have Mec-Gar build magazines under their brand names. These are high-quality, reliable steel magazines at an affordable price. This magazine features interlinked magazine components plus an Anti-Friction Coating. As if increased firepower from the Optimum were not enough, the 19-Round magazine comes witha Plus Two adapter installed that increases magazine capacity over the regular Optimum Magazines.