The Ion will shoot inconsistently for a number of reasons. An easy fix is to check if your paintballs are .68 caliber. Different paintball sizes can cause paintballs to break inside the breech and shoot inaccurately. Make sure that your air tank has plenty of air and is tightly fastened into the Ion. If your Ion's battery is low, the gun will gradually fire more slowly. To fix this, check out the battery replacement guide. To adjust the fps, use a 5/8" inch wrench to adjust the black hex nut located under the front grip. Be careful to adjust the velocity in small increments. It is important to take 5-10 shots in between adjustments to allow the regulator to adjust to the new pressure. Turning the black hex nut clockwise adjusts the velocity up, and turning counter-clockwise adjusts the velocity down.

First make sure that your hopper is securely fastened into the Ion's Feed Tube located on the top of the gun. If paintballs are entering the fire chamber and the gun is still not shooting, then the vision eyes are covered with paint. To test this, turn the Ion's vision mode off by pressing the power button. Vision mode is off when the power button flashes in a double blink sequence. If the Ion fires while vision mode is off, then the vision eyes are dirty. To fix this checkout the vision eyes replacement guide. Once the eyes are cleaned, try firing the Ion while in vision mode. The Ion is in vision mode when the Ion's power button flashes in a single blink sequence. If the gun fails to fire again, the eyes may be damaged and need replacement.

After heavy use, the Ion's macro line can wiggle loose from the fittings causing air to leak out. To fix this, check out the macro line replacement guide. If the macro line continues to leak after replacement, the leaking may be caused by the macro line fittings and not the macro line tube. The macro line fittings need to be replaced.