When you own paintball guns or just maybe use them from time to time it is a good idea to make sure that they are clean before and after each use. This is true for anything that discharges like a firearm. What takes just a little thought is the type compounds and oils to use while performing maintenance.
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Knowing what material your paintball gun is made of should help in deciding the chemical to use for cleaning. More likely than not, the focused concern with the cleaning is about dissolving dried paint or debris from discharge from use. Another overall but most likely minimal concern from cleaning is the presence fumes if any.
After cleaning, applying sparse lubrication is another good idea for paintball gun maintenance. Naturally, these hand-held devices are not all manufactured the same. Some require oil, and others need grease. And others still, should have both kinds when properly cared for.