There may be some on here who have fired a gun in city limits, shooting a squirrel or such. Most places count paint ball, BB's and even potato guns as firearms. The caveat is the projectile leaving your property, in the country there is a longer range. As for infringing, there should be the ability to own anything, and MAYBE be organized (regulated) in having common caliber equipment. A requirement to be a member of any group becomes just another form of government.
There should be a mechanism for "felons" to regain use of firearms. A lot of them were never violent, and many people don't grow a brain until mid 20's so have an incident from youth following them. There are also a lot more things called felonies, even carrying a knife with a long blade into certain areas.
