This isn't what we've been told.
In fact, I was just at a boy scout jamboree in the fall at a boy scout camp, and all the cub scouts were using bbguns and doing archery.
We are setting this all up through our Boy Scout Council, and they are completely aware of everything we are doing, and have even assigned us the bbgun and archery ranges.
If this is a council sponsored event, then yes, BB gun and Archery will be available. Our council has several 'family' campout weekends that any cub family can attend with or without Den/Pack registration and they have all these activities available. For general Pack campouts or reservations, then no.