I was interested in a QB78-Deluxe for some time and couldn't pass up a great AGD deal during 2016's 'Black Friday' week. It's been several years now and I have no regrets. Initial impressions were very positive, particularly the all wood & metal construction plus the heft of its solid steel barrel (I measure OD~0.59'). Front and rear fiber-optic sights appear to be all metal (die cast?) with rear adjustments for elevation and windage. Limited mostly to my 35 ft basement 'range', I enjoy the challenge of free stand shooting so having decent, adjustable iron sights is a big plus. The QB78 is surprisingly powerful for a CO2 rifle. It easily sends Crosman .117 wad-cutters thru both sides of a tin can at 35 ft and being able to load two CO2 cartridges gives a high shot count per fill. For me, fills can stretch over a number of sporadic sessions so I'm extremely pleased to find NO evidence of CO2 leaks, even after the QB78 sits dormant for a month or two. Overall, I find the QB78 a really good bang for the buck and I'm very pleased with it.
Download Free Qb78 Pcp Conversion Kit For Macbook Pro
Learn how to convert your QB78.22 Cal or.177 Cal air rifle into HPA, start using air instead of the pricy Co2, and get more stable FPS readings for your shots! 001-0056 Replacement Co2 cap to convert your QB/XS78 & XF501 to Bulk Fill Co2 with this adaptor with Brass Cap NOT FOR HPA. Used: An item that has been previously used. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or an item that has been returned to the seller after a period of use.
This easy to install kit replaces the bolt as well as the transfer port seals of your QB allowing more gas to flow through the port and into the chamber. To see just how much power these mods can give your rifle we chronographed a stock.22 cal QB78 Deluxe for 10 shots using JSB pellets. Doubt the standard cylinder would take the pressure needed for pcp conversion, or valves would be suitable either, personally i think it would be cheaper to just buy a pcp, A proper safe and tested conversion would cost more than you could buy a decent pcp for. This easy to install kit replaces the bolt as well as the transfer port seals of your QB allowing more gas to flow through the port and into the chamber. To see just how much power these mods can give your rifle we chronographed a stock.22 cal QB78 Deluxe for 10 shots using JSB pellets. 3000 psi tube QB78 Its been one of my rituals with new air rifles here lately.lol. My plans are being made around the 3000 psi tube and a hand pump rather than Co2 because really I live in one of the freak temperature provinces Nova Scotia.
Pros
Overall, a fun rifle and a great bang for the buck.
Cons
When new, the safety had to be muscled ON & OFF and it took a fairly long time to break in. It's a lever that rotates ~180? forward (fire) and back, into the trigger guard for 'safe'. In the safe position the lever can over-rotate, making it difficult to get a finger on it to flip the other way. Maybe a defect or maybe just a clumsy safety design, but hardly a deal-breaker.
Compasseco Airguns
| 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 |