[machone]

I have the Caswell hobby gun. I clean it every time I use it, but some times the trigger sticks on me. I disassembled the trigger assembly and found a little powder in the valve. I thought about putting a little oil in the trigger, but I figured if there's powder in there then it could get through & contaminate my powder. Is the powder supposed to be getting through? I tried increasing the air pressure and that seems to help a little, but now I'm wasting alot of powder and sometimes it still sticks. Any thoughts?
mach