Tokyo Marui Mp5k 110mm tightbore (PDI and Tanio Koba don't make this size?)
 

I found AEG tightbores by Prometheus, KM, etc... in 110mm, but I can't find the PDI or Tanio Koba in this size. I checked each of their websites respectively.
The PDI site http://www.x-fire.org/etop/01.html does not list one for 110mm.
The TK site http://www.taniokoba.co.jp/ won't let me access it and just reads "sorry Japanese only."