| 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 |
Instruction Manual For Smk Xs78 Qb78 22 Cal Air Pistol
The QB78 C02 Pellet Rifle A User S Text, photos and illustrations by George Fox Lang An introduction to using the classic QB78 pellet rifle, one of the nicest and most popular C02 rifles ever produced. The QB78 is a svelte sculpture in steel and hardwood sold at a bargain price. Instruction manual for @smk smk xs78c02.22(5.5mm) calibre double charged c02 xs78c02. Read all instructions and warnings carefully in this manual before using this c02 air rifle important warning: this is not a toy. Misuse or careless use may cause or result in serious injury or death. SMK supply a 4x32 scope with the package, along with two piece mounts, and considering the cost of the complete outfit, finishes off the SMK XS78 very well. A CO2 air gun is like others, the propulsion of the pellet towards the target is initiated by the power source of the CO2 gas load. Well, starting at the beginning, my QB78 (=SMK XS78) Family Workshop Manual tells you everything you need to know to dis-assemble and re-assemble your air rifle, with loads of pix, data and other information. You can see it at b78fwm.htm. Most tunes concentrate on increasing muzzle velocity.