Source? Be specific.
Are you serious? Read the second amendment.
It says, "a well regulated Militia, being necesary to the security of a free state", not "a well armed citizenry, being necesary to the security of a free state".
In Federalist 29, Alexander Hamilton said, "The project of disciplining all the militia of the United States is as futile as it would be injurious, if it were capable of being carried into execution."
"But though the scheme of disciplining the whole nation must be abandoned as mischievous or impracticable; yet it is a matter of the utmost importance that a well-digested plan should, as soon as possible, be adopted for the proper establishment of the militia. ... By thus circumscribing the plan, it will be possible to have an excellent body of well-trained militia, ready to take the field whenever the defense of the State shall require it."