The Rex Zero 1 Standard Model offered is a 17-round 4.25 barreled 9mm pistol with several unique features: - Can be operated either cocked & locked or safely de-cocked for DA/SA operation. External safety operates in either configuration. - Ambi- safety and magazine release. - The slide-stop also serves as the de-cocker. - Hard anodized T7075 aluminum frame made from solid bar stock with steel locking block insert. - Nitrocarburized steel slide made from solid bar stock. - Forward cocking serrations. - 1 piece cold hammer forged barrel made from solid bar stock and Nitrocarburized. - Loaded chamber indicator - Full length slide rails. - Picatinny railed dust cover. - Large trigger guard for use with gloves. - High profile white dot steel sights. Accepts replacement sights - Approved for all commercial SAAMI specification +P ammunition - 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 / 195 mm - Barrel Length: 4.3 in / 108 mm - Height: 5.7 in / 144 mm - Width (slide): 0.98 in / 25 mm - Width (frame): 1.1 in / 27 mm - Width (safety levers): 1.46 in / 37 mm - Weight (without magazine): 29 oz / 826 g - Weight (empty magazine): 3 oz / 85 g - Magazine Capacity: 17 - Trigger Pull SA: 5.5 lb / 25 kg - Trigger Pull DA: 13 lb / 60 kg - Trigger Travel DA: 0.5 in / 13 mm - Reset Travel SA: 0.16 in / 4 mm - Barrel Pro?le/Twist: 6 grooves right-hand twist - Barrel Twist Rate: 9.8 in / 250 mm