AR-15 Challenge: How Well Do You Know America’s Iconic Rifle? What does "AR" stand for in AR-15? Assault Rifle Armalite Rifle Automatic Rifle American Rifle None Which caliber is most commonly associated with the AR-15? .308 Winchester 5.56x45mm NATO 7.62x39mm .45 ACP None What is the operating system of the AR-15? Gas piston Direct impingement Blowback Lever-delayed blowback None Which of the following is NOT a common accessory attachment for the AR-15? Foregrip Red dot sight Suppressor Bayonet lug None Which company originally designed and developed the AR-15? Colt Smith & Wesson Armalite Ruger None Time's up Most Popular Most Popular
