Soviet arsenal black on Combloc steel — the lacquer, the substrate decision, the oil purge, and the spray. The factory finish on Russian AKs, RPKs, and PKMs.
Bench Reference
The Refinishing of a 1988 Izhmash SVD
Restoring the laminate stock and handguard set of a 1988 Izhmash SVD to original combloc character — amber shellac and hand-rubbed wax, applied with restraint.