The right was for the militias to be ready to protect the federal government FROM enemies both within and without. Today that function is fulfilled by the various state National Guard units, who are rightfully issued military style weapons.
But, private citizens were never meant to have such weaponry. This does not mean that you can not own legitimate hand guns, rifles, and shot guns that are non military in nature. Nobody (including your hated liberals) is saying that you can not own such non military style weapons.
That right was NEVER meant to help you in a violent revolt against the federal government as some of the more vehement ultra conservatives are saying.
And when President Obama takes the oath of office today he is pledging to take Abraham Lincoln’s same position on this and protect the federal government from revolutionary terrorists, both within and without the federal government!!