Its not that hard...People WANT to make it hard, but all you have to do is read it...
Its so that CIVILIANS have access to basic weapons (well regulated means well equipped) so that they COULD form a militia, if they needed to.
This is so simple it is mind boggling, yet people want to make it complex.
1)Who would form the militia: Civilians
2) Who needs the arms so that they could form the militia: Civilians
3) What type of arms are needed: Something that would make them 'well regulated' or well equipped...IE the basic weaponry that would be issued to infantry such that they would have a fighting chance.
It does not say 'non dangerous' weapons. It says WELL REGULATED for a reason. The civilian militia would be pointless if it did not have similar rifles that were issued to the common soldier of the day. I'm not saying grenade launcher or special weapons like flame throwers...I'm just talking about your standard semi auto rifle, magazines, and ammo.