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The Rock River Arms PPS carbine employs the company's patent-pending Performance Piston System (PPS) to reduce recoil, as well as residue in the upper reciever. It features a purpose-designed bolt carrier, an adjustable gas piston and an over-the-barrel spring and guide rod arrangement. The result is a departure from the traditional recoil system associated with AR-style firearms. The rifle is expected to be available to law enforcement later in 2010.

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