Get to the yellow portal, like MachineGunner1, avoid lava and shoot the bullets, kill boss in level 6. Earn epic guns like pistols, machine guns, shotguns, and machine guns! Press space to fire shotgun, press down arrow to fire pistol. Click to fire machine gun. On level 4 you have to use shotgun to kill the bullet. Level 2 is pistol, level 5 is machine gun.
Thanks to @PICKLE_DUDE for shooting script (machine gun only) and sound. MACHINEGUNNER3 IS IN THE WORKS IT IS COMING THE MAN THAT CREATED THE SENTRY IS DEVASTATED THAT YOU DESTROYED HIS BEST CREATION HE IS AFTER YOU IN THE THIRD VERSION.