This Magnum Research Magazine is a factory original replacement part, manufactured to the same specifications and tolerances using the same materials as the OEM magazine that came with the pistol for a guaranteed fit and reliable operation. When it comes to semi-automatic firearms, the ammunition feeding device often determines if, and how well, the gun functions. Therefore, whether for use as a backup mag for your concealed carry or duty pistol, or simply for saving a little reloading downtime while at the range, keeping a few spare factory magazines handy is never a bad idea. This factory magazine fits the original IMI / IWI Baby Desert Eagle (Jericho), first generation Magnum Research Baby Desert Eagle, and new production Magnum Research Baby Desert Eagle II pistols chambered in 40 S&W with either a Full Size (4.52" barrel) or Semi-Compact (3.93" barrel) frame. It features a 12-round capacity and black polymer base pad.