The NFA of 1934 made the import to US small since the 200$ tax of class-2 firearms was far more than the original value of the trejo. The Firearms Act of 68 finally slammed the door into the U.S. (therefore also to much of rest of the world) and finally the mexican government closed down domestic production of firearms for private purchase. The Trejo was also made in semiauto only, a longer BBL model with larger capacity (11-shot) called Modelo 2 came out and also a Modelo 3 in .32auto and 9mmShort/.380acp. (Could say more about them but they were not the Trivia).
Full-auto versions of the Modelo-1 is marked Tipo-Rafaga (selective
fire type) and a little Lever with a "R" marked for Rafaga. In all practical
senses it is identical to a M1911 which is known to many shooters.
The rate of fire is very high, ranging from 1300-1400 rounds per minute depending on what type of ammuntion you use (higher velocity = higher rate of fire). Bursts can be shot from about three rounds up to a blistring eight bursted out and unloading the whole magazine in 0,4 seconds flat. A minus for this type of construction would be the unreliable .22LR rimfire cartridge.
Trejo Modelo 1 Machine Pistol
Action: Unlocked blowback, closed bolt selective fire
Rate of fire: 1300-1400rpm
Magazine: 8-shot capacity single-row
Sights: Fixed Ramp front open-notch rear