Don't feel left out!

Sounds like a winner and exactly what the market needs. Which guns do you plan drop in barrels for ?

Everything I possibly can!... lol...obviously all Kral Family guns, Avenger/liberty Family. Those will likely be the first runs but will sell blanks to fit or make drop in barrels for most current brands and models including FX/Daystate/Brocock/AGT/Taipan. 
 
Maybe RTI?
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If I can get measurements I can get a drop in barrel. I'll get you covered. 
 
They have a 212 bore with 217 groove diameter.

Is the bore and groove surface area about equal? What slug diameter do you expect to work best?

It's 70/30 70% being groove to reduce friction. Being .217 groove diameter I expect .217 or possibly .2175 to perform best. Went .217 to have the highest likelihood that pellets will shoot well too.