Not sure if you got your question answered
Pickings on the north end of Colorado Springs are limited, so your son will need a car.
Pikes Peak Gun Club is located east of the Colorado Springs Airport but is a member's only pistol/rifle range.
Pikes Peak Gun Club
Dragon Man's is a little further east of PPGC and open to the public.
Whistling Pines is a very nice members only indoor range, but pricey
Frontier Sportsman's Club is another members only range with one east of Falcon and another east of Fountain
Frontier Sportsman's Club of El Paso county, Colorado an NRA Affiliated Organization
Once the get the Rampart Range shooting area reopened, that will probably be the most convenient for him.
Last option is the ranges at Fort Carson. Open to Active Duty/Retired and their dependents.