The MAS-38 is 623mm (24.53 in) long with a 224 mm (8.82 in) barrel; it weighs 2.87 kg (6.33 lb) empty.
It uses a 32-round box magazine.
The muzzle velocity is 350 m/s (1,148 ft/s) and it has a rate of fire of 600 to 700 rounds per minute.

The MAS-38 was chambered for the 7.65mm Longue cartridge, which although similar to the .30 Pedersen cartridge is not an exact copy.
The 7.65 French Longue cartridge is nearly identical to its predecessor used by the Pedersen device, but with slight differences in the groove of the shell.
This was also the cartridge used for France's M1935 series of service pistols, allowing for limited standardization, but with the effect of preventing French soldiers from using captured enemy ammunition.

The MAS-38 is easily recognizable due to its unorthodox receiver layout.
This is because the receiver and butt diverge in alignment from the axis of the barrel by several degrees, making the weapon compact as its bolt recoils inside a tube running through the buttstock, while also enabling a lighter bolt to be used by providing mechanical disadvantage to the pressure from the expanding propellant gases.
To allow a natural aiming stance, the butt had to drop while the receiver had to remain in alignment.
This required that the bolt approach the breech at an angle and the face of the bolt was cut obliquely to allow it to close evenly on the cartridge.
The MAS-38 also features an unusual safety catch: the bolt was locked (in either the forward or rear position) by pushing the trigger forward.
A valuable feature was that tools were not required for its disassembly.

A very high quality weapon, the MAS-38 was machined from solid steel with only a few stamped parts.
It was designed with a buffered sear assembly to prevent wear and increase the life of the internal parts.
A dual range sight system was concealed within the receiver so as to be out of sight until it was flipped up for use.

The odd appearance of the MAS-38 did not detract from its accuracy, but its cartridge was underpowered compared to the German 9mm standard pistol ammunition.
The MAS-38 is 623mm (24.53 in) long with a 224 mm (8.82 in) barrel; it weighs 2.87 kg (6.33 lb) empty. It uses a 32-round box magazine. The muzzle velocity is 350 m/s (1,148 ft/s) and it has a rate of fire of 600 to 700 rounds per minute.
The MAS-38 was chambered for the 7.65mm Longue cartridge, which although similar to the .30 Pedersen cartridge is not an exact copy. The 7.65 French Longue cartridge is nearly identical to its predecessor used by the Pedersen device, but with slight differences in the groove of the shell. This was also the cartridge used for France's M1935 series of service pistols, allowing for limited standardization, but with the effect of preventing French soldiers from using captured enemy ammunition.
The MAS-38 is easily recognizable due to its unorthodox receiver layout. This is because the receiver and butt diverge in alignment from the axis of the barrel by several degrees, making the weapon compact as its bolt recoils inside a tube running through the buttstock, while also enabling a lighter bolt to be used by providing mechanical disadvantage to the pressure from the expanding propellant gases. To allow a natural aiming stance, the butt had to drop while the receiver had to remain in alignment. This required that the bolt approach the breech at an angle and the face of the bolt was cut obliquely to allow it to close evenly on the cartridge. The MAS-38 also features an unusual safety catch: the bolt was locked (in either the forward or rear position) by pushing the trigger forward. A valuable feature was that tools were not required for its disassembly.
A very high quality weapon, the MAS-38 was machined from solid steel with only a few stamped parts. It was designed with a buffered sear assembly to prevent wear and increase the life of the internal parts. A dual range sight system was concealed within the receiver so as to be out of sight until it was flipped up for use.
The odd appearance of the MAS-38 did not detract from its accuracy, but its cartridge was underpowered compared to the German 9mm standard pistol ammunition.
MAS-38