Oh also, use a wooden dowl to press down each cap on nipple. It will fire.
After two or three cylinders, the nipple will be dirty on the outside, and this will cause misfires. I don't know why, but it does.
What I do is take a pipe cleaner while shooting, and use it to floss the nipples on the gun exactly the same as flossing your teeth.
You'll want to run a wet patch down the barrel every 2-3 cylinders as well for accuracy.
I clean the cylinder intermittently. Not as much as I should, but its a pain. The nipples and the bore are what you HAVE to clean. Keep up with it, and the gun will not let you down. Don't keep up with it, and the gun will quickly let you know.
I keep an extra set of nipples in my pouch too. When they start getting too dirty for the floss, just tap that key out, pop off the cylinder, and put the fresh nipples on, guaranteed to give you enough time on the range to get sunburned before coming home to clean.