Don’t forget cannons. Private citizens could own artillery pieces in the 18th century, so we should be able to own them today as well.
I have no problem with my neighbor keeping his M-777 in his garage along with all the solid shot he wants as long as the powder was stored off-site. That said, he should be liable for any damage caused by the improper storage, transport of use of any HE rounds he might have. A suburban neighborhood is a lousy place for a magazine. I'm sure our HOA would object.
You can. But, only the muzzle-loading, black powder variety...