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None of my references say anything about a plating on these, but it replaced the model 60 which had a chrome plated bolt, bolt handle, and trigger.
the surface finish can be increased by perfect machining in the moulding die( i.e, by plating , lapping which gives more surface finish and reduces the friction of material flow).
Use of feeder layer.
it is a plating of immersion
This will depend on the material you are interested in plating with. As the price of gold goes up, even plating with gold will become more and more expensive. Plating with silver will be less pricey than plating with gold.
alkaline zinc plating is less expensive to prepare and maintain , and it do not cause pollution as cyanide zinc plating.
Gatero's plating offers a nice chrome plating kit for an affordable price, and you can buy them online at http://www.gaterosplating.co.uk/Replica-Chrome-Plating-Kit.php. They also have other plating kits.
Plating can be used for resist the rust & corrosion.
While chrome plating on teeth is not accepted by dentists, at least not yet, gold and silver teeth plating is common.
Gold plating depends on the spot price of gold. Gold plating is extremely thin, but gold is expensive too.
There are various plating services around the world, from what i have seen and found, the top places are: Ashley Jewlers, www.ashleyjewelers.com/services_plating.html and, Artisan Plating, www.artisanplating.com, and lastly Gold Plating Services, www.goldplating.com...
Many car and body shops might be able to do chrome plating. There are also specialize shops that specialize in chrome plating.