The Rex Zero 1 is a double- action/single-action (DA/SA) semi-automatic pistol working on the short recoil, locked-breech system.
At first glance it can be mistaken for a Sig P-series pistol, but that’s where the similarity ends, for the Rex Zero 1, made by Arex in Slovenia, was designed in-house and has an array of features that makes it unique. The Standard (full size) pistol in 9mmP has a magazine capacity of 18 rounds and is 190mm long and 140mm high; the frame is 27.9mm wide, while the widest point (measured through the ambi-safety levers) is 37mm. Barrel length is 4.25" (108mm). With its alloy and steel construction, the pistol, unloaded, weighs 810 grams.