RE: Rossi 21
Hi Squid,
The parts you will need to convert the R21 to venturi are 6542, 6565,6571, and 6572.
I have retrieved the parts list to scan, and will e it to you soon.
If you do not find the time to pursue your R21 project, I would be interested in buying it from you.
BTW, I am pretty sure you have a 6 transfer version.
RR