I agree with Adam and p0rtalman. Some people may think because there 1337(

) but, in some case scenarios AR would be best. AR is more for medium to close range. BRs are medium to long range. And, yeah the AR is more iconic. I mean I haven't seen any games come close to the AR's design.
BR's are closer to Famas' (Obviously) not to mention the SR is also based off the 50-cal.
EDIT: I forgot to say.. did you forget Adam molds Halo armor and AR's to.