Originally Posted by myrifleisLapua
Looking for a gloss black finish for stainless
Salt bath (Isonite QPQ) nitriding (also known as meloniting) is available in a gloss black. Two known good suppliers:
MMI Trutec (Joel Kendrick) - Trutec
H&M Metal Processing - Welcome to H & M Metal Processing
Note that nitriding is NOT intended to be decorative but it is. Many upsides and some downsides, the most significant downsides are it may void your barrel warranty (check your barrel provider) and once done it is not easy to work on (as in its more permanent than you may want. On the upside, increased velocity, better barrel life, less fouling.
Some K&G products
are also available "gloss black" and they have neither of the downsides of nitriding - but they are less effective on the upside.
Frankly, this is one of the most contentious subjects that could be brought up. Enjoy the debate.