The J20 features 4 low-damage-dealing, lock-on missiles. The J20 also has a 2-front-firing explosive round and machine guns that deal average damage. The J20 features 2 gem upgrades: the Gun Upgrade and the Super Missile Upgrade. The Super missile upgrade seems to drastically increase the damage of the J20's missiles, which is locked behind level 50. The Gun upgrade currently seems to have already been applied to all vehicles regardless of level for no gem cost.