WtS: Ace 1 arm f1 slider with after market rmr sight!! All internals are new and all upgraded around 480 put in this build look up price your self part list: Cowcow piston Cowcow guide rod with 130 spring Ready fighter blow back Gun modify hi flow nozzle Gun modify sights Maple leaf hop up Crazy jet inner barrel Decepticon bucking Gun modify return spring nozzle Any question hit me up Tm/we compatible (trade for a tm hi capa) Asking $350