ARK Charging Handle for DIY Upper

Modification of BrewNinja's ARK Charging Handle. This one is for the "DIY" Upper in the ARK files. Changes include: - Designed for the "DIY" Upper! - Enlarged handle cover for an easier grip - Main contact area is hollow to allow insertion of a screw for reinforcement - Beveled surfaces so it works properly within the DIY upper with no binding\sticking when in use - Altered height of main assembly for proper clearance within the upper assembly. - Room for an optional ballpoint screw detent: this will require addition of a detent "pocket" on the upper to accommodate