Conversion Kit

The process of converting an AR-9 pistol to a rifle typically involves adding a buttstock, which changes the classification of the firearm from a pistol to a rifle under federal law. This conversion is regulated by the National Firearms Act (NFA) and the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF).

To comply with the regulations, the conversion process must be done in a specific order. First, the firearm's barrel must be at least 16 inches long. Next, a buttstock must be added, which must be a permanent fixture and not easily removable. Finally, the overall length of the firearm must be at least 26 inches.