Pressure drop, leak near bolt.
so i just bought an Ion and At first I was having problems with after the first shot the pressure would drop off significantly and wouldn't shoot again. I'm not sure what I did (asa not all the way open ? tank all the way on ? ) but for now its staying pretty steady on the pressure gauge after each shot, But I have a hissing leak coming from the feed neck/ bolt area. Is this most likley an O-ring problem that i need to replace or something more significant ? I am running on compressed air, any help would be appriciated.