"Misfires". The gun just goes "pfft" and the pellet stays in the barrel
This is what they sent me...
"We're sorry for the problems with firing. We have found with this model that some pellets are tighter in the barrel than others and this model is sensitive to the more restrictive pellet brands. Pellets with smaller diameters tolerances tend to function the best. At 330fps the pressure is much lower for these FAS 6004 than many pellet companies design pellets for, you may need to try multiple brands to find a brand that works best."
I have already tried at least two. I asked them for suggested brands and have not heard back. I was thinking about ordering some different brands with pellets that were lighter, but any advice would be appreciated.