QB78, 79, AR2078, AR2079 PCP Conversion |
To remove the safety lever must first set it to the 'S' Place a block under the module trigger and safety lever rod knock. |
After knocking out the safety lever. |
Unscrewing the lock nut from the bottom of the barrel to hardwood stock. |
After separation. |
Separating trigger casing assembly requires unscrewing two screws. |
Removing the barrel |
Unscrew the screw compression strap. |
To unscrewing use allen key, size 2.5. |
Remove the barrel of a strong, firmly, pulling along the barrel. |
After removing the screws of the trigger assembly remove plugs from the casing tube and breech. |
The separation of housing/body |
Under the barrel, after removal, there is a bolt connecting two tubes of the body/housing. |
To remove the breech bolt put back Allen key. |
Dismantled components tube and breech. |
Removing the valve |
Unscrew the screw and unscrew completely locating screw for fastening hardwood stock. |
Pushing the valve is possible in many ways, for example by pushing it through the hole in the tube with a screwdriver. |
Disassembly the valve |
When reassembling, change the spring. |
Tuning Step 1 (optional) |
Tuning to vastly increase the muzzle velocity and power of your QB78 air rifle! Muzzle energy increases from about 25 ft/lbs for a .22 caliber gun. Muzzle energy increases from about 22 ft/lbs for a .177 caliber gun. |
Step 2 |
Valve dimensions change You should change the dimensions of the indicated elements - use a lathe or a drill and sandpaper; the effect is big enough when you are able to put a valve into a tube. |
Charge valve |
Tube assembly |
QB78 PCP Warning: maximum pressure should not exceed 200 bar |