The gun used in Dayton has the same core component as an AR-15-style rifle. It also has a 100-bullet magazine. But it's legally considered a pistol.

The PTR-32 pistol has a receiver end cap that is threaded for the attachment of AR-15-type arm braces. The SB Tactical SBA3 is pictured. Because of the G3-sized receiver, MP5-style stocks and arm ...