i started this when i started my pps43 build. since the 43 came out so good i decided to revisit this one. i had extended the shroud to accommodate the 18" barrel, welded in repair section, mated barrel to trunnion...and let it set.
started removing rust today... . pulled the barrel/trunnion out of this mess
and chucked it in my lathe to sand it down. just surface rust from an evap cooler. below is rust removed and waiting for casey's super blue.
using sean's tried and true method, found here, Login, i did the barrel and trunnion. here it is after 6 applications.
super blue is supposed to be a blacker finish than the cold bluing. one thing i found is that during the process, if i rub it down w/ 0000 steel wool soaked in the bluing solution, let it set, then wipe off and do another coat, it seems to help in the chemical reaction. it comes out much blacker and much more luster after polishing with steel wool and oil in the end. below is a pic, not great, but it shows how dark it gets.