Quote:
Originally Posted by tvfreakazoid
So we know there are piston and DI ar15 rifles. They both have a metal rod that pushes the bolt back right?
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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!