Airsoft Master feature the G&G GTP9 GBB Pistol in this video, showing its features that airsoft players can consider when looking for a new GBB pistol... "The G&G GTP-9 gas blowback airsoft pistol features a special design inside the nozzle/cylinder to lessen the chance of freezing up. It has a built in adjustable hopup system with an adjustment tool stored under the pistol grip."