QB78, 79 PCP Conversion
| QB78, 79, AR2078, AR2079 PCP Conversion | |
 
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To remove the safety lever must first set it to the "S"
Place a block under the module trigger and safety lever rod knock.
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After knocking out the safety lever.
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Unscrewing the lock nut from the bottom of the barrel to hardwood stock.
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After separation.
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Separating trigger casing assembly requires unscrewing two screws.
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| Removing the barrel | |
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Unscrew the screw compression strap.
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To unscrewing use allen key, size 2.5.
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Remove the barrel of a strong, firmly, pulling along the barrel.
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After removing the screws of the trigger assembly remove plugs from the casing tube and breech.
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| The separation of housing/body | |
 
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Under the barrel, after removal, there is a bolt connecting two tubes of the body/housing.
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To remove the breech bolt put back Allen key.
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Dismantled components tube and breech.
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| Removing the valve | |
 
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Unscrew the screw and unscrew completely locating screw for fastening hardwood stock.
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Pushing the valve is possible in many ways, for example by pushing it through the hole in the tube with a screwdriver.
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| Disassembly the valve | |
 
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When reassembling, change the spring.
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Tuning Step 1 (optional) | |
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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 
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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. | |
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Charge valve
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Tube assembly
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QB78 PCP Warning: maximum pressure should not exceed 200 bar |