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Archer Airguns "XP" Tuned Valve for QB78
Archer Airguns tuned valve kit for Chinese QB78 family CO2-powered wood and metal airguns. Also fits Crosman 160.
NOT FOR SALE TO CANADA.
 
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Our Price: $43.99


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Product Code: XPTUNEDVALVEQB78
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Description Technical Specs
 

Degree of difficulty: *****
Will fit the Crosman 160 if used with the Archer Airguns Crosman 160 Seal Kit.

NOT FOR SALE TO CANADA OR ANY LOCALITY IN THE USA WHERE IT WILL MAKE THE AIRGUN ILLEGAL IF INSTALLED. OVERSEAS CUSTOMERS,PLEASE MAKE SURE THAT IT IS LEGAL TO USE IN YOUR COUNTRY BEFORE ORDERING.

Contains the complete tuned valve assembly. Suitable for .177 and .22 calibers.

When the tuned valve and breech seal (included) are installed in a QB78 family air rifle, the muzzle velocity is increased by 70 fps compared to the performance of a standard factory gun. If installed in conjunction with the Archer Airguns "XP" Tune Kit, a total increase of 130 fps in muzzle velocity will be achieved.


It is recommended that the Archer Airguns QB78 Hammer Debouce Device (HDD) is used in conjunction with this valve for the maximum number of shots per fill of CO2.

Removal of the existing valve is best undertaken by a special tool which is not available from Archer Airguns. Do not even think of ordering unless you understand what you are getting in to! Specially packaged by Archer Airguns.




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Archer Airguns QB78 Family Workshop Manual Archer Airguns "XP" Tune Kit for QB78 Family
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Archer Airguns workshop manual for Chinese QB78 family CO2-powered wood and metal airguns. Also for Crosman 160. Archer Airguns tune kit for Chinese QB78 family CO2-powered wood and metal airguns.

Average Customer Review: 5 of 5 Total Reviews: 2 Write a review:

  0 of 0 people found the following review helpful:
 
Very Satisfied May 12, 2018
Reviewer: M. Van Dyke from SoCal  
My new untouched QB78 with about 250 pellets through it chronographed two shots with 14.3gr pellets at 474 fps and 469 fps on fresh cartridges.  Installed the Archer XP tune kit and Archer XP valve, enlarged the gas port in the barrel to 0.157" and deburred.  Cleaned the bore.  Chronograped two shots with 14.3gr pellets at 643 fps and 644 fps.  70 degrees F, they may run faster on a warmer day.  Very happy with the performance increase.

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  1 of 1 people found the following review helpful:
 
Works as advertised June 22, 2014
Reviewer: Jimby from CA, USA  
My QB-78 is a "mod mule" and barely resembles the stock QB-78.  It started out with a Mike Melick highly-modded valve that put out about 700 fps with 14.3g CPs.  Eventually, after years of use, I started to have some problems with the piercing pin on the valve, and then the valve seal disappeared.  

I decided it was time to replace the valve, so I bought the XP Tuned Valve as a drop-in replacement.

Installation went smoothly, and so far the XP valve is giving me 650-660 fps with 14.3g CPs, which is exactly what I expected.  I'm happy.

For the previous reviewer:  You might want to check if you are getting leakage from the transfer port. Some tissue paper draped over the breech will "jump" with each shot if you don't have a good seal there, and a leak will rob you of power.  If so, you'll probably need modify that seal.

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