It appears the Greystone above is the name of a company, not the process.
I've hunted around to find out about the greystone process also and what I've come up with is, its a nidriding process. Now there are several types of nitriding, most involve some type of heat-treating (like the Browning & new Krieghoffs), and some of the nitriding involves inducing a thin layer of other material, like titanium nitriding.
A few years back, I had called Beretta USA and just happened to speak with someone with an Italian accent about why they discontinued the greystone. He told me it was too expensive for a production gun. That was also the reason why none of the guns are chrome plated like the earlier gun. The greystone and chrome receivers need to be polished perfectly to get the final result.
I've checked with a few companies that have done the new crazy rainbow nitriding you see on a few handguns. They told me they only do it for manufacturers...larger quantities.
You might look around in your city to see if there are any coating shops. You might find that there is a small shop that specializes in nitride coatings or specialty coatings like that.
We have lots of those places in San Diego and up here in San Luis Obispo. They are just not something that advertise on TV. Look in your local yellow pages and make a few calls. You can even call some of your high end machine shops in town to see who they use to coat parts.
I used to work as a Mechanical Engineer early in my career and I had numerous projects where I needed a part to be just a tad harder, or a bit tougher, so I found a shop in town that could put a carbide or a nitride hardening on a part. Just a bit of free advice.
GunDr did you happen to hit the link and read the info there?
7992 Richmond Road
Toano, VA 23168
Contact: Jessie Moser
Products & Services:
With TS16949 Certified facilities in Virginia and Rhode Island, Greystone offers Hard Chrome, Hard Anodizing, Zinc and Zinc-Iron Plating, Electroless Nickel, Decorative Nickel Chrome, Watts Nickel, Nickel Sulfamate, Chemical Deburring, Electropolishing, Heat Treating, Passivating and Manganese Phosphate.
Greystone is a world class high volume precision plater that focuses on superior responsiveness and customer service.
Specializing in high volume precision plating, Greystone is an industry leader in the automation of rack plating and a pioneer in the development of customer specific plating processes. Greystone has received several compliance awards from government agencies. In-house laboratories and state of the art inspection equipment ensure customer satisfaction.
Rack: Automated & Manual
Hex-Free (Trivalent) Chromate Colors - Clear, Black, Yellow
Hexavalent Chromate Colors - Yellow, Bronze, Olive
Mid & High Phosphorus
Low Phosphorus Available On Request
Decorative Nickel Chrome
Nickel Sulfamate - Tensil & Compressive
Chemical Deburring - Carbon Steels
Electropolishing - Stainless, Brass & Other Alloys
Rack: Automated & Manual
Hex-Free (trivalent) Chromate Colors - Clear, Yellow
Hexavalent Chromate Colors - Yellow, Black, Olive
Zinc Chloride Available For Castings
Support Customer Lean
Dry Film Lubricants
Over 100 years combined plating experience at each location.
For more information on Greystone Inc, please click on Greystone Overview.
For more information on firearms finishing, please click on Complete Firearms Finishing.
Please visit our website at www.greyst.com or you can also visit www.platingjournal.com which is a good site to see more areas where we have specific technical expertise.
I tried to find out what the greystone finish was, once, without success. I wanted to plate both of my shooters with it.
I don't like the "coin" finishes. I wanted a darker hue to my receivers' plating. I happened to see some of the gun's Tony DeSimone had done and liked the look, which is grayer ... not as gray as the greystone but still very attractive. Tony did all the preparation work and finished the metal so that the surface would be 'Matted". I am very pleased with both the appearance and durability and have grown to like it better than the greystone. Good luck.
I found a company here in Lakeside Ca that does a form of Titanium Nitrade called SLP, TN is Gold in color and the TN/SLP process changes the color to the Greystone color I was looking for. I am going there to pick up samples and will keep all of you informed. Cory
The cost is $300.00 minimum, but he said you can get approx 4 pieces done and still be under the minimum approx. $66.00 per piece, I am going to have 2 receivers and 2 forend iron pieces so it will still be the $300.00 minimum but that sounds like a deal to me, also I found another variation they have called TiCN, almost a perfect match to Greystone! I will take a good picture of the sample and upload later. Cory