QB-78 SMK - Airgun spares. B1792 Rear trigger casing screw. QB78/SYN XS78 Tactical stock, uses standard length stock bolt. 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.
| 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 |
Average Customer Review
4.5
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5.0 5.0
5.0 5.0
5.0 5.0
Things I liked: Great build quality and good accuracy. Best single shot CO2 rifle for the money.
Things I would have changed: I wish the rear sight was more easily adjusted.
5.0 5.0
5.0 5.0
5.0 5.0
Verified Purchase
Things I liked: Easy for younger people to shoot
Things I would have changed: Nothing
What others should know: I now have three of these for my grandchildren. They are perfect for them on the ranch.
1.0 1.0
5.0 5.0
4.0 4.0
See all my reviews
Things I liked: Wood stock. Blued finish. Accuracy
Things I would have changed: Quality control and reliability . My rifle failed after just shooting less than 30 rounds. The PSI dropped significantly to about half during my very first shooting session and has to go back to Pyramid the next day. To this date still waiting for the replacement.
What others should know: Nothing much to share 'cause I haven't had the chance to spend enough time with the rifle.
Instruction Manual For Smk Xs78 Qb78 22 Cal Carbine
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