Originally posted by Mr. Tapes
Check the o-rings on the on-off. Obviously if it is off and air is getting to the bolt, there is problems with the on/off at least. When the on/off is half between it sounds like the air is coming from around the bolt, so it might fix your problem entirely.
before i read you post i completely gutted my gun. lpr, bolt, on/off. the clear oring on my on/off was shreaded. and thanks to PaintbyNumbers i got that all sorted out, although my oring kit dident come with #12 orings for it