Some people will say there is no advantage of the piston system over the DI system. But owning both I can say that the piston system definately runs cleaner and requires far less lubrication. At first I thought that all these companies coming out with PS guns was just a marketing ploy, but now after having experience with one I can see the benefits. It will be interesting to see what comes out of the next series of M4 tests this fall. If the US military switches to a PS AR there will be a good reason behind the decision.
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