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Hatsan Jet I Double Barrel Upgrade?

Are you referring to the dual air cylinder swap? If so, the change is very easy, just a couple screws and your done. I did it to my .25 Jet 1 and really don't see how it would have any affect on accuracy. All it's doing is adding more air storage for a bit more shot count.

Now, if you are talking about a double barrel, I have not heard of this option and would be interested in hearing more...
 
Trying to pull the block/valve assembly from single cylinder jet 1 to install the double cylinder. I removed the hex screws securing the pic. rail and front of the trigger guard. I've read that there are grub screws beneath these. To me it just looks the threading to hold the hex screws. What am i missing? What tools/size do I need to loosen the grub screws?