CZ USA 91351: This CZ Scorpion sub-gun is a blowback-operated semi-auto in 9mm with a 7.75\" cold hammer-forged barrel. Its muzzle features 1/2x28 threads hidden underneath the factory flash hider, meaning users can fit either 1/2x28 or 18x1 accessories to the muzzle. Equipped with a low-profile sights, its rear sight has four different aperture sizes for everything from close quarters to way out there. The sights ride on an 11\" Picatinny rail perfect for mounting optics. It has a polymer frame with a QD sling swivel pocket integrated into the rear sling attachment point. Simple and reliable, the Scorpion not only has ambidextrous controls, its non-reciprocating charging handle is swappable and trigger reach is adjustable.This black model has a 20-round magazine.