re criminals machineguns there s only one way i know of to tell an ar from an m pick it up hold it about a foot from your face and look closely at the saftey lever if it has two positions its an ar if it has three its an m there are numerous internal differences as well but since one would have to field strip the weapon to see them they are not valid in this discussion so in conclusion there is very little external differences to distinguish an ar from an m except at close very close range david bixler auburn university all standard disclaimers apply
