Tac One: stammering paint-blender

[Henchman]

Ok. So I received the carriers and o-ring kit from Tuna and started the tuning process again with a new o-ring.

Starting at a size 2.5 carrier and going down I had to go down to a 1.5 to keep it from leaking down the barrel. With the 1.5 carrier it fires fairly consistently and can RT sporadically. I can sweet spot it and get 5-7 shot bursts before I have to flick the trigger to reset the on/off again. I'm using the ULT. Is it the ULT on/off sticking or the bolt? How can I tell?

Also, the efficiency is TERRIBLE! I got about 2-300 shots on a full 68/4500 tank dry-firing... Is that normal?

I'm starting to get frustrated... Should I just go through the whole marker and replace all the o-rings and try tuning again?

Air your gun up and stick it in a tub of water, to see if there ar any air leaks anywhere, you should eb getting at least 800-900 shots from your tank.
Then, open up the valve and give it a thorough cleaning, and oiling, everywhere.

[SpyderBoy]

I've submerged the gun while aired up and no leaks. Also, I've completely stripped and cleaned and oiled everything in the valve. The reg side and the on/off and power tube side. I've cleaned the on/off and power tube side twice. My o-rings are about 5 years old though except the carrier o-ring which I just replaced.

[athomas]

Ok. So I received the carriers and o-ring kit from Tuna and started the tuning process again with a new o-ring.

Starting at a size 2.5 carrier and going down I had to go down to a 1.5 to keep it from leaking down the barrel. With the 1.5 carrier it fires fairly consistently and can RT sporadically. I can sweet spot it and get 5-7 shot bursts before I have to flick the trigger to reset the on/off again. I'm using the ULT. Is it the ULT on/off sticking or the bolt? How can I tell?

Also, the efficiency is TERRIBLE! I got about 2-300 shots on a full 68/4500 tank dry-firing... Is that normal?

I'm starting to get frustrated... Should I just go through the whole marker and replace all the o-rings and try tuning again?

The ULT can cause some bolt stick issues if too many shims are installed. Take one out and try it.

Dry firing a mag will cause terrible efficiency because the chamber completely empties on each shot. Normally, there is residual pressure left in the chamber after a shot, so the next charge only has to top up the pressure.

[SpyderBoy]

The ULT can cause some bolt stick issues if too many shims are installed. Take one out and try it.

Dry firing a mag will cause terrible efficiency because the chamber completely empties on each shot. Normally, there is residual pressure left in the chamber after a shot, so the next charge only has to top up the pressure.

Ok. That is comforting. I'll try removing a shim in the ULT.

Removed a shim from the ULT and the cycle improved quite a bit. It's too late to check velocities now so I'll report back tomorrow. Thanks for all the help!