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26 March, 2010

New QB78 Tune Kit for Increased Muzzle Velocity


Archer Airguns is introducing its "XP" Tune Kit for QB78 family air rifles. This kit enables you at easily increase the muzzle velocity of any QB78 family air rifle by 100 fps, including the QB79, AR2078 and AR2079 as well as the identical Tech Force TF78, TF79 etc models.

This tune kit takes .22 caliber muzzle velocities for QB78 family air rifles from about 530 fps at 75 degrees F to around 640 fps at the same temperature, increasing the muzzle energy from around 8.5 ft/lbs to about 13 ft/lbs as it does so. This makes the QB78 family much more suitable for hunting and longer range shooting. And it's all done just by replacing two parts in the gun.

In this post we'll look at test results, all shot from the same .22 caliber QB78 Deluxe. The results are shown as graphs. The top line represents muzzle velocity and is read against the left axis. The lower line shows the muzzle energy and is read against the right axis. The figures along the bottom give the temperature in degrees F as - like all CO2 guns - the performance varies with temperature due to the physical properties of the gas. In every case, higher is better!

First, we see the performance of the stock, .22 caliber factory gun.

Next, we see the same gun, same pellets, fitted with the "XP" Tune Kit. Note the difference!

In confirmation of the improved performance, I tested the tuned gun with heavy RWS Superpoints, as follows. As you can see, the results were very similar.

And finally, we have another test, this time with Crosman Premiers. Again, the gun is shooting at just under 13 ft/lbs at 75 degrees F.

And the down side to this improved performance? The shot count drops to about 35 shots per fill, from 50 in factory tune. But, in my opinion, that's not a bad trade-off for such improved performance!

Either you can buy the "XP" Tune Kit and do it yourself, or I'll fit it to QB78 family air rifles purchased at the same time for a small fee.


About This Blog

This blog shares information, ideas and knowledge about air rifles. It compliments the information Stephen publishes on the Archer Airguns website, on YouTube and the Chinese Airgun Forum.

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