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The Bushmaster Gas Piston Rifle was created to give shooters a cleaner and easier to maintain version of the Bushmaster M4. The company says that the internal area of the upper receiver, including the bolt, bolt face, extractor, and firing pin, are kept cleaner and cooler than in conventional M4/AR-15 rifles because a sizable percentage of the hot gas and debris that would normally be injected into the upper receiver is kept inside the gas piston chamber to power the operating rod. The gases and burned powder that are not used to power the rod are vented from the rifle.

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