voruzon---You might want to check with an industrial HVAC suppy house & see if they have thermal transfer paste, It's used for the samething as the CPU/heatsink paste & may be a little less expensive. I have a jar from Honeywell but can't remember how much it cost me. I use it when installing temperature gauges & RTD's in thermal wells. For this kind of thing to work the Ultimak mount will have to be a very close fit to the barrel, very close. Just getting rid of the plastic (Insulated) hand gaurd will probably help quite a bit in radiating heat from the barrel.
Good luck
Bushwack
Good luck
Bushwack