Step 8: Lubricating Properly
If your marker came with a small bottle of lubricant, by all means, use that.
If it did not come with any, i suggest using a pneumatic tool lubricant, it's not petroleum based (so it won't corrode O-Rings) and lets face it, a paintball marker is a nail gun that shoots balls filled with goo.
You must lubricate:
The chamber around the hammer.
The hammer itself.
The front plastic piece (and around it)
And it helps to keep your valve system nice and clean by putting a few drops of lubricant through the ASA into the air lines and shoot a few times with air in the system.