Quote:
Originally Posted by MistWolf
It's a misconception that the AR is a direct impingement system.
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Now you're just going off the rails. First, there is no reason to even bring this up. Everyone in the AR world, who cares, knows the difference between gas piston and direct impingement. Second, trying to say that direct impingement is really a gas piston system is splitting the finest of hairs.
No one doubts or even tries to suggest that the AR doesn't have a piston or cylinder. All direct impingement means is the gas is brought back to and used directly at the BCG.
Comparing it to the rare, or at least extremely uncommon, Ljungman rifle is pointless. Yes, they're different, but both use the gas directly at the BCG. In the Ljungman the gas pushed directly on the BCG. In the AR, the gas pushes on the bolt and the bolt pushes the BCG back.
In a piston driven rifle, the gas is used away from the BCG. It pushes on a rod which then acts on the BCG or directly on the bolt as in the Mini or M14.