Quote:
Originally Posted by BlackZeda
You are mistaken...The DI has a gas tube that couples with a gas key which directs the gas into the rest of the bolt carrier group. The gas piston system utilizes the push rod which will mechanically move the BCG back into the buffer. The BCGs necessarily have to be different.
Hope that helps!
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A conventional Stoner-design AR is a true expanding gas piston gun too and not direct impingement. It's just that the piston is the bolt carrier group and there is no actuating rod. Direct impingement is something else.