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Archer Airguns "XP" Tune Kit for QB78 Family
Archer Airguns tune kit for Chinese QB78 family CO2-powered wood and metal airguns.
 
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Our Price: $44.99


Availability:: Usually Ships in 2 to 3 Business Days
Product Code: XPTUNEKIT


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Description
 

Degree of difficulty: ***
Not suitable for the Crosman® 160


DOES NOT FIT THE QBII Mod 1085

Muzzle energy in .22 cal is approx 13 ft/lbs at 75 degrees F. Muzzle energy in .177 is approx 11 ft/lbs at 75 degrees F.

XP Tune kit includes: 2 breech seals, 2 bolt O rings, 6 barrel O rings and one 1.25mm Allen wrench.

By popular request! Over the years many people have asked us to tune or enhance the performance of their QB78 family air rifle. This kit provides about 100fps muzzle velocity increase with most QB78 family air rifles and you can fit it yourself or have it fitted to a new gun by Archer Airguns. NOTE, the XP Tune Kit is not compatible with the AR2078B and AR2079B (side lever cocking) models.

Use the Archer Airguns “XP” Tune Kit to vastly increase the muzzle velocity and power of your QB78-family air rifle by changing just two simple parts!

Gain most of the performance benefits of a professional tune at a fraction of the price and enjoy doing the work yourself. In fact, the price of our tune kit is about the same as you would pay just for shipping your QB78 to a tuner and back - before even counting the cost of the tune.

Typical muzzle velocity of a .22 caliber QB78 family air rifle is about 525fps at 75 degrees F. This tune kit increases that to around 635fps at the same temperature (depending on pellet type used).

Muzzle energy at 75 degrees F increases from about 8.5 ft/lbs for a .22 caliber gun in factory trim to around 12.9 ft/lbs. This is a huge increase of over 50 per cent.

.177 caliber guns typically show muzzle velocities about 100 fps higher than .22s, in both factory and tuned versions.

Now includes new, black breech seals.

This increased muzzle velocity now makes your favorite QB78 family air rifle far more suitable for hunting or longer-range shooting. Also fits the re-branded QB78 family air rifles such as the Tech Force TF78, TF78D, TF78T and the SMK XS78 and XS79.

Can be used in conjunction with the Archer Airguns "XP" Tuned Valve Kit for QB78 Family to achieve a total muzzle velocity increase of 130 fps compared to factory condition.

For more details of performance, please see our blog at www.archerairguns.info and search for QB78.

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Archer Airguns QB78 Family Workshop Manual
Our Price: $29.99

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Archer Airguns workshop manual for Chinese QB78 family CO2-powered wood and metal airguns. Also for Crosman 160.

Average Customer Review: Average Customer Review: 4.5 of 5 4.5 of 5 Total Reviews: 8 Write a review:

  0 of 0 people found the following review helpful:
 
5 of 5 XP Bolt Kit October 19, 2020
Reviewer: Jimmy D from Califiornia  
Just put  the new bolt kit in my QB78 in 177 caliber, it did help improve the performance. Not hard to install , but  I have done some other Mods. to this gun.  I mostly use this one for my backyard shooting, shooting PEST in my yard (when I hunt I prefer my 22 caliber) It did increase the crack a little but FPS and FPE . I Like IT.  Many Thanks to Mr.  Archer when I need parts his shop is the one I go to.

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  0 of 0 people found the following review helpful:
 
2 of 5 Not what I expected May 30, 2020
Reviewer: Terry D. from Iowa  
I installed this on a .177 rifle. It increased fps about 35fps. Had I known this I wouldn't have bothered.

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  0 of 1 people found the following review helpful:
 
5 of 5 Wow! Major improvement! January 26, 2018
Reviewer: Todd from Missouri  
I'm a big tuner of the crosman 22xx series/Disco model air rifles. I'm trying my hand at the QB series now.
I immediately tore the rifle down and cleaned, deburred, polished, etc. During this process, I ported the valve and also ported the stock bolt. This helped the gun tremendously, but it still wasn't as hard hitting as my 2260 with basically the same mods.
After I installed the XP kit and fired it at a piece of wood I tested it prior on, it punched right through! Even with all the other mods, before the XP bolt, it would crack the back of the wood bit not penetrate. It barely stuck in the wood in out of the box condition.
It still gets decent shot count from 2 carts, even with the valve mods. I feel confident this rifle will now take squirrels out to 40 yards, humanely, with out issue.
I highly recommend this product if you're wanting better power out of this rifle.

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  1 of 1 people found the following review helpful:
 
5 of 5 Update March 22, 2012
Reviewer: Bruce Rusnak from San Marcos, CA United States  
Just received the "XP" kit today and was very easy to install (I purchased Mr. Archers QB78 manual a while ago and was well worth the investment).  The thing I really like is that Mr. Archer includes not just one set of seals and O-Rings but two so if you happen to damage one you do not have to sweat it.  Hope to try it this weekend...Well, I was able to do some testing using a chronometer and got between 755 to 760 fps which was about a hundred fps increase (it was a very hot day (about 90 degrees F).  I do not mind the decrease in the number of shots but the one thing I do not like is that if you do not put in the pellet correctly in will fall in the hole where the hammer assembly is (that's when things get nasty).  I was lucky the first time and I managed to get the pellet out but a friend was using it and had to take apart the gun.  It was worth the money but do make sure you put in the pellet correctly....

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  1 of 1 people found the following review helpful:
 
5 of 5 THANK-YOU MR ARCHER! November 17, 2010
Reviewer: john davies from stalybridge, cheshire United Kingdom  
Thanks for the speedy dispatch of the xp tune kit, 9 days to the UK.The kit was simple and easy to install, after polishing and a good grease round, the gun was 'superb' loads more power. 10/10 Steven

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