Tuning QB78D vs. XS-60C (CO2 in .22 cal)

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pecci

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Nov 8, 2020
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I'm planning on asking Mike Melick at Flying Dragon to do a power-tune on either a QB78 Deluxe or the XISICO XS-60C in .22 cal. I know both of these Co2 rifles are highly thought of. I know that as soon as the (.22s) are sent to Mike and as soon as the QB78D is back in stock, I can get the ball rolling.

I would like to hear some of your opinions on which one I should choose, and why. Goods & bads ... pluses or minuses, strengths & weaknesses ... and which of the 2 you would choose. 

Much obliged!


 
I own both and they are very similar. Externally they look more different than internally. For example the valve and trigger group are virtually identical.

The most meaningful difference I can cite is the built-in adjuster for hammer spring tension on the XS-60C, and it’s a big enough advantage to tip the scales since the hammer spring tension is critical to getting decent shot count on any CO2 rig.

However if you are a tinkerer and plan on making modifications, I would steer you toward the QB. It’s a long-lived and proven platform with a tremendous amount of mods and tuning information out there. The monolithic air tube is also a more favorable arrangement for HPA conversions.
 
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The OEM poppets are brass with an embedded polyurethane seal. Their longevity is very good actually so long as debris doesn’t get into the system. In my experience, the main advantage is that a hard poppet is easier to knock open, allowing the use of a lightweight hammer. Together, they make for vastly reduced cocking force, better efficiency, and a more pleasant shot cycle, which in turn makes the gun less hold sensitive.

With that said, I don’t know if Mike does lightweight hammers but it wouldn’t hurt to ask.
 
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