In its design, Pistol M57 is similar to the design of the Sovient pistol TT. It has been popular for decades due to its proven high quality.

Pistol M57 A is an upgrade of basic model M57.
It has an external safety and ergonomic improvements in polymer handgrip covers and the bottom of easily detachable magazine.
The design of the pistol M70A  is similar to design of Soviet pistol TT, that is, model M57. Pistol M70AA is an upgrade of basic model M70A. It has external safety.