Nah, the only reason IMO is that Bushmaster makes as good of better rifle than Colt, and for less money. The AR series is very flexible, having everything from belt fed light machine guns, carbon fiber pistols, and long range competition "Space Guns", and most are NOT Colt. Equating AR to Colt is just a Cop being wrong.
AR comes from Armalite, who employed Eugene Stoner to develope them.
They still produce the AR-15, AR-10, AR-18, and some other cool stuff. Great rifles, they also make real long range rifles, like AR-50.
Thanks. I was just wondering if the shooter might be using more than one. Maybe one for longer distance over another. Guess not.