Wraithworks Warscorp9 Builders Set. Build your own 9mm firearm with this Warscorp9 build kit. It comes with the essential building blocks of the firearm. This allows you to choose how you want to build it out, whether it is a pistol or a rifle. This lower receiver accepts CZ Scorpion Magazines. INCLUDED Lower Receiver Ambidextrous Button Magazine Release Paddle Magazine Release Ambidextrous Bolt Catch Ejector Feedramp Upper Receiver Filler Block Side Charging Handle 9mm Bolt