Comment: Simple answer

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In reply to comment: Tanks and RPG's (see in situ)

Simple answer

...and TANKS for asking...

Many people own tanks.

Weapons that kill indiscriminately are considered "offensive", and therefore, weapons of war (AKA mass murder). These would include bombs, hand grenades, mortars, nukes, etc.

Having said that...Any weapon typically issued to an individual soldier should be available to the individual private citizen.
M-16 with (aimed) grenade launcher, S.A.W., minigun, for example.