[CaptainBubba]

The Militia Act of 1792 specifically defines arms as military style firearms suitable for use in a militia. Other ballistics are not adressed and therefore your right to own them is not protected by the second amendment. Arms is not a term up for contention, or at least not since 1792.

Though you could just purchase a .50 sniping rifle legally for several thousand dollars cheaper that is equally effective at taking down large and small aircraft.