Caliber: 9mm Luger (9x19mm) - Operating Principle: Short recoil - Action Type: Modified Browning linkless locking system - Trigger System: Single- and Double-action Hammer fired - Length: 7.7 in - Barrel Length: 4.3 in - Height: 5.7 in - Width (slide): 0.98 in - Width (frame): 1.1 in - Width (safety levers): 1.46 in - Weight (without magazine): 29 oz - Weight (empty magazine): 3 oz - Magazine Capacity: 17 - Trigger Pull SA: 5.5 lb - Trigger Pull DA: 13 lb - Trigger Travel DA: 0.5 in - Reset Travel SA: 0.16 in - Barrel Pro?le/Twist: 6 grooves right-hand twist - Barrel Twist Rate: 9.8 in - The Rex Zero 1S pistol complies with strict military standards for reliability and has passed extreme temperature hostile environment and drop tests. The expected service life for the pistol exceeds 30000 rounds.