Lloyd Smale
Member
the ar was desinged to be a no frills cheap to build reliable rifle. It met those criteria without the added cost of a gas piston. Im sure theres some benifit to it but bottom line is they work well without it and if you figure all the ars out there in service around the world right now and add a 100 bucks a gun to make them gas piston it would add up to a big chunk of changes.