The ZEV O.Z-9 Combat features all the same functionality and modularity of the O.Z-9 in a configuration optimized for durability. Built with ZEV's windowless Citadel slide, PRO match barrel and PRO Curved Face Trigger, the O.Z-9 Combat is tailored to meet the stringent requirements of the discerning professional user. Also, our patented steel receiver, the extended rails in the steel receiver help provide more than double the surface area of contact to the slide. A single take-down pin conveniently located at the front of the trigger guard locks the removable grip to the steel receiver.