An AR Pistol is a AR-15 platform weapon, that meets the legal definition of a pistol, rather than a rifle, by replacing the stock with a “pistol stabilizing brace”. You cannot have a fore grip on an AR Pistol, although a hand stop is legal and recommended for safety. There are also limits on the overall length of the weapon, and length of pull (the distance from the trigger to the rear of the brace). They are very popular since a well built AR pistol, can deliver most of the advantages of an SBR without having to get a tax stamp.
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