Basically brand new G&G G2 gearbox with QCS guide and ETU unit. This is fully operational and has been professionally reshimmed to the motor, cleaned and relubed with Superlube. Gearbox has also been modded so you can drop in a Gate Titan or BTC Spectre. Currently set up for a traditional non-ambi selector switch. Features: - 8mm steel bearings - CNC aluminum double o-ring cylinder head - CNC aluminum double o-ring air nozzle - G2 FMR piston - Quick Change Spring guide - G2 gearset, short stroked 2 teeth - ETU trigger with MOSFET - IFRIT 25K Motor - CAA style motor grip - Dean's plug You almost never see one of these come up by itself outside of having to buy the whole gun! No trades!