User blog comment:Postapocfan1999/Joel (The Last of Us) vs Bill (Left 4 dead 1)/@comment-4661256-20130716044743/@comment-4661256-20130718205806

"They don't jam as much as the M4." ... what? The M4 probably doesn't jam. The original AR-15 and M16 were the rifles that jammed. By the time the M4 carbine was developed, that problem was long gone, solved by the lessons learned in Vietnam.