If you're speaking of something for the range to have, they would probably need to comply with OHSA regs. which would deal with type of hazards, no. of employees, no. of shooters, distance to hospital, etc.
I would think besides a normal type kit, you'd want to include items for eye injuries: sterile water or eyewash solution in pint or qt. bottles, eyepads, firm dixie cups; burns if any dumb reloaders at range; bullet holes, foil or saran wrap for sucking chest wounds, large compresses like battlefield dressings, triangular bandages; air splints if somebody falls off the back of pickup and breaks arm or leg--also good to control bleeding; ice paks and neck collar for whiplash if any hotties at range.
Individual kit could be put together but wouldn't need to include splints or collar.