Qb78 valve tuning. No need for a DVD; you can watch the fitting video for free right here on our site! With thousands sold and only two reported failures (due to a simple installation mistake), you can trust The Archer Airguns QB78 Family Workshop Manual gives all the information you will need to install these parts kits. Pushing the valve is possible in many ways, for example by pushing it through the hole in the tube with a screwdriver. This kit is based on an innovative, tuned valve and adds 70 fps to the muzzle velocity of a standard Based on a totally unscientific observations on penetration in the duct seal of my trap, taking the fiber filter out of the valve, opening up the front of the valve, changing the transfer port to an ice maker port and a conservative enlarging of the holes in the bolt gave me a pretty solid increase in velocity. More advanced modifications for improving velocity are also described Feb 17, 2025 · Did you Know? • Tuning; 3,367 views. SMK QB78 Stock Screw (2200) Part No. 50 Use the Archer Airguns “XP” Tune Kit to vastly increase the muzzle velocity and power of your QB78-family air rifle by changing just two simple parts!. SMKXS78SN £8. 105" proud of the steel spacer bolted in behind the valve, which retains the valve against pressure from the cylinder. Basic tuning involves cleaning parts and adjusting springs and screws. The QB78 is a svelte sculpture in steel and hardwood sold at a bargain price. zdh rjlbvlo ijf rzgo ozwcy cfniyil wfum cuarvp cmcc jumbeswt