Our billet aluminum "Stinger" trigger for the CZ Scorpion Evo S1 is machined out of 6061 aluminum then Type 3 Black Hard Coat Anodized for a factory look. The new sharp lines of the trigger give the scorpion an aggressive look. The front serrations provide tons traction when wearing gloves in cold weather conditions and at the same time is easy on the finger when not wearing gloves. This trigger also counts as one of the parts to be 922r compliant.