Airsoft replicas are available for a wider variety of guns, and Airsoft also gives you a lot more leeway for practice, including indoors and even force-on-force with some goggles and possibly ear protection (not for noise, but to keep from getting a pellet in the ear canal). With a BB gun, you still have to be careful about safe directions downrange, and can't do FoF.So why would airsoft beat out pellets and metal bbs for those things?