QE Shrouded Barrel

I have a Hatsan BullBoss and I need some help with the Shrouded Barrel - I open the end of the barrel to clean it and the two caps fell out (#2948) this is the number on the Hatsan website for the shrouded Barrell. I would like to know what orientation to set them in. 1 end is open - the other end has a small hole - does the ends with the small hole go back to back?

thanks
 
Welcome. You're welcome.

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If you want it quieter glue round sticky felt circles inside and use a soldering iron to melt holes in the centers just a little larger than the pellet. You can even stick some small hair curlers cut to fit wrapped with felt or scotch brite pads lubed with oil then put them back into the QE gun only if you need it quieter than it is right now.