Introducing the Retro Arms polymer bodied steel toothed piston. Featuring a injection molded polymer body infused with carbon fiber and molybdenum paired with a CNC milled and heat treated tooth rack, this Retro Arms piston is surely one of a kind. To further increase reliablity, the final tooth has been shaved to help improve angle of engagement and reduce premature wear. Whether you are simply installing a higher quality piston in your AEG or you are building a high end set up, this 14.5 tooth piston body is sure to hold up to the task and then some.