American Firearms Instructor Adam Decciccio reckons the AR-10’s extra nine pounds (compared to the M4) is a burden worth bearingo. Amidst the sound of gunfire, Adam says the bigger bullet’s knock down power makes all the difference. “You put one round in the target and you keep moving,” he declares, readying TTAG’s test ArmaLite. “It shoots twice as far and you don’t have to worry about shooting it five or six times.” If an Afghanistan War combat vet says he wouldn’t mind carry a couple more pounds to gain a tactical advantage, it’s a calculation well worth considering.