Obregón pistol

The Obregón is a Mexican designed semi-automatic pistol designed in the mid-1930s by the mechanical engineer Alejandro Obregón. It uses the same .45 caliber ammunition as the Colt 1911 and it resembles the 1911 in overall appearance, frame size and weight. However it features a rotating barrel locking system. This system employs a diagonal cam on the rear of the barrel sliding against a diagonal receiver-mounted groove that rotates the barrel. This is like the Austro-Hungarian Steyr M1912 pistol, unlike the "swinging link and pin" of the Colt M1911 series.

Obregón
Type	Semi-automatic pistol
Place of origin	Mexico
Production history
Designer	Alejandro Obregón
Produced	1934–1938
No. built	less than 1,000
Specifications
Mass	1,130 g (40 oz)
Length	216 mm (8.5 in)
Barrel length	127 mm (5.0 in)
Cartridge	.45 ACP
Action	Short recoil, rotating barrel
Muzzle velocity	253 m/s (830 ft/s)
Effective firing range	50 m (160 ft)
Feed system	7-round detachable box magazine
Sights	Front blade and rear notch

Pistola Obregón

One of the Obregón's design simplifications is that the safety switch and the slide lock are a single unit. Less than 1,000 of these pistols were produced at the national armory in Mexico City between 1934 and 1938.[1] It was not a sales success, nor was it commissioned by the Mexican government.