I think the difference between the sig 516 piston and hk416 piston is that hk's piston is self regulating and the sig's piston is adjustable. I like the 416's piston better because. The fire control/safety selector is an ambidextrous design. On the plus side, since the rifle is. The rifle comes with magpuls adjustable stock and pistol grip, which is a nice addition to an ar.
The 556's piston system is more reliable. If you did a long training with the 516 and 556 you would spot the difference. The 556, like an ak, can just keep on firing when fouled up.
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