OFASTS hosts so many types of machine guns it would be impossible to shoot them all in a two day event (you’d also go broke trying) but one notably absent “machine gun” is any type of slide fire or bump stock device. Federal regulators who first ruled that a rifle with an attached bump stock did not fit this definition have recently revisited their ruling and now, following the use of such devices in a single high profile mass-shooting and at the urging of President Trump, have re-defined not only rifles with attached bump stocks, but the bump stocks themselves as machine guns.