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 first generation Magnum Research Baby Desert Eagle with either a Full Size (4.52" barrel) or Semi-Compact (3.93" barrel) frame.