I also have an Optima V2 nitride rifle an pistol. I have shot both CVA BH209 plugs and Ron's modified plug. Like said both are reliable and shoot every time, but I have found the modified plug is much easier to clean after soaking in hoppes and no need to scrape out any fouling as it comes right out with a pipe cleaner. The liner has to be removed as well for cleaning.

Just my experiences and I now have both modified plugs installed in both guns with the BH plugs as backup.