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Archer QB78 XP Tune Kit Velocity Upgrade  .177 cal
Archer QB78 Velocity Upgrade - XP Tune Kit Increases Velocity

Archer QB78 XP Tune Kit Velocity Upgrade .177 cal

Your Price:$34.99

Part Number:119-XPTUNEKIT

Archer QB78 Airgun Velocity Upgrade .177 Cal
Provides approximately 100 fps velocity increase with any QB78 air rifle.
  The specific design of this kit increases the per-shot CO2 gas volume and that simply translates into higher muzzle velocities. The kit works by opening up two constrictions in the standard factory QB78 design. First, a simple replacement of the breech seal between the barrel and the gas tube. This results in a stiffer and more open gas channel into the breech. Second, a replacement "XP" bolt allows more gas volume behind the pellet as it fires. The results are measurable and usually somewhere in the neighborhood of a 100 fps increase in muzzle velocity.
  Installation Procedure - You will need to disassemble your QB78 receiver, barrel, and bolt assembly in order to install this upgrade. This degree of dis-assembly will require the QB78 Family Workshop Manual for instructions (sold separately). As you can see from the picture, the kit also replaces barrel O-Rings, the bolt probe O-Ring, and includes replacement set screws for the barrel and bolt handle retention. Note: Some localities may prohibit increasing the velocity of an airgun and you will be responsible for compliance with the laws. Note: This is not compatible with .22 caliber.
  See all of our QB78 accessories, parts, and rifles at our QB78 Home Page.

4 Stars
I installed this and got a good 60 fps increase not 100. I'm happy with a 10% increase from a drop in mod.. Reason for 4 stars is obvious, manufacturer as always, claims are inflated and unrealistic. Easy to install. & 10% increase = 4 solid stars
Reviewed by:  from Boston. on 7/24/2016
5 Stars
Follow Up
I have recieved the QB-78 Tune Kit, and have installed it in my air gun. Works very well. Thank you.
Reviewed by:  from na. on 6/24/2016

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