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Changing any of the internal components of the airsoft gun such as gearbox gears, piston, piston head, bushings, spring, spring guide, trigger, trigger contacts, cylinder, cylinder head air nozzle just to mention a few of the internal upgrades as well as the external upgrades, as all types of optics, hand guards, stocks, vertical grips, mounts, barrels, and many more can be added to your gun before shipment. Most of the external upgrades can be added by yourself.
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