User blog comment:Goddess of Despair/GROM vs North Korean Special Operations Force/@comment-5931345-20130718033103/@comment-4661256-20130718205639

Hey Bulls, contrary to what you said, the H&K does not have carbon fouling malfunctions. According to Wikipedia, "the HK417 is a gas-operated, with a short-stroke piston design... [that] is more reliable than the original direct impingement operation of the AR-10 and AR-15 designs, because, unlike these weapons, it does not vent propellant gases directly into the receiver, which deposits carbon fouling onto the bolt mechanism...." The H&K 417 works perfectly fine.