The Desert Eagle was originally designed by Bernard C. White of link Magnum Research, who filed a patent on a mechanism for a gas-actuated piece in January of 1983. This established the inherent layout of the Desert Eagle. It consisted of a gas-operated mechanism attach to found in rifles, as opposed to the decreased recoil or blow-back designs most commonly seen in semi-automatic pistols. A second patent was filed in December of 1985, after the basic design had been refined by IMI for production, and this is the formation that went into production.
This is because the .41 AE was based on a shortened .41 Magnum case with the rim and extractor groove cut to the same dimensions of the 9 mm Luger. This allowed the same extractor and ejector to grind with both cartridges. The .50 AE has-been a congruent rebated rim, cut to the same dimensions as the .44 Magnum. This is what allows caliber changes between .44 Magnum and .50 AE with just the correction of the barrel and magazine.