It's well established by SCOTUS that the 2A covers ownership of firearms unconnected to militia use:
>District of Columbia v. Heller, 554 U.S. 570 (2008), is a landmark case in which the Supreme Court of the United States held that the Second Amendment protects an individual's Right to keep and bear arms, unconnected with service in a militia, for traditionally lawful purposes, such as self-defense within the home, and that the District of Columbia's handgun ban and requirement that lawfully owned rifles and shotguns be kept "unloaded and disassembled or bound by a trigger lock" violated this guarantee.
>They also noted that though the right to bear arms also helped preserve the citizen militia, "the activities [the Amendment] protects are not limited to militia service, nor is an individual's enjoyment of the right contingent upon his or her continued or intermittent enrollment in the militia." The court determined that handguns are "Arms" and concluded that thus they may not be banned by the District of Columbia.
https://en.wikipedia.org/wiki/District_of_Columbia_v._Heller