... Personally, I would not use the NG, as the vehicle to "organize" gun-owners.
I am old-fashion, and would prefer a Citizen's Militia, organized by precinct, county, state and national levels.
... I believe, that based upon previous militia statutes, this body is mandatory for all citizens, 16 to 55 years of age, and requires the "militiaman" to personally maintain a minimum level of lethal weaponry.
Title 10 of the US Code states:
(a) The militia of the United States consists of all able-bodied males at least 17 years of age and, except as provided in section 313 of title 32, under 45 years of age who are, or who have made a declaration of intention to become, citizens of the United States and of female citizens of the United States who are members of the National Guard.
(b) The classes of the militia are—
(1) the organized militia, which consists of the National Guard and the Naval Militia; and
(2) the unorganized militia, which consists of the members of the militia who are not members of the National Guard or the Naval Militia.
Many states also maintain their own State Defense Forces. These forces are federally recognized militia but not as an armed force service. Because of this, they are separate from the National Guard and are not meant to be federalized. They serve the state exclusively, especially when the National Guard is deployed or otherwise unavailable.
State Defense Forces (SDF) (also known as State Guards, State Military Reserves, or State Militias) in the United States are military units that operate under the sole authority of a state government, although they are regulated by the National Guard Bureau through the Army National Guard of the United States. State Defense Forces are authorized by state and federal law and are under the command of the governor, as State Defense Forces are distinct from their state's National Guard in that they cannot become federal entities. The federal government recognizes State Defense Forces under 32 U.S.C. § 109 which provides that State Defense Forces as a whole may not be called, ordered, or drafted into the Armed Forces of the United States, thus preserving their separation from the National Guard. However, under the same law, individual members serving in the State Defense Force are not exempt from service in the Armed Forces (e.g., draft). NGR 10-4 further states: "State regulations should provide for immediate discharge of SDF members who have been appointed, inducted, enlisted, ordered, or called in the Armed forces [sic] of the U.S., or a Reserve component thereof."
Although nearly every state has laws authorizing State Defense Forces, approximately twenty-two states, to include Puerto Rico, currently have active State Defense Forces, each with different levels of activity, state support, and strength. SDFs generally operate with emergency management and homeland security missions. Most SDFs are organized as Army units, but Air and Naval units also exist.
I do not trust privately organized military units. They are likely to have ethnic, religious or political bases which undermine rather than support democratic government.