Let's not forget that even a short or long stroke piston system accumulates deposits, and typically have to provide a gas adjustment to cater for the decrease in operating reliability as they get dirty or in adverse conditions...
Think about the design brief that brought about the development of the M16, weight and simplicity were key inputs. The outcome was an ingenious solution with few compromises, and resulted in a tool much more surgical and precise than many alternatives and certainly it's commie counterpart. Something a lot of us Service Rifle shooters take advantage of now.
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