Be careful. Chrome plating creates a condition called hydrogen embrittlement. If the parts are subject to repeated high stress microscopic cracks can/will develop causing eventual failure. There is a company chrome plating 1911's successfully, probably combined with some sort of stress relieved heat treatment. Sorry but the name of that company escapes memory. Just be aware that chrome plating creates brittle areas that are subject to repeated stress failure. Marc
The electroless nickel might be a better option - it can be controlled to very small amounts (multiples of 0.0001 inch) without affecting fitting back in. The electro-plating processes, like chrome and others, also have an edge buildup that can be troublesome on the outside corners.
As mentioned above (by "luvtrapguns"), hydrogen embrittlement can occur and it depends on the hardness of the part on whether it's an issue or not. Hard steel parts (like Rc 28/30) can easily suffer from it and the result is micro-cracking at a high stress point. Atomic hydrogen migrates to the high stress areas - hence the embrittlement. There are a ton of proprietary coatings on the market, for lubrication & corrosion, so maybe don't overlook them too. Good luck finding someone - there are tons of platers all over the country but all are not equal.
Define the "Chrome" you are referring to. There is decorative chrome and there's industrial Hard Chrome. They are two totally different processes. Guns in the past were, and cheap guns are Nickel and or Chrome plated with decorative Chrome, thus they peeled. Industrial Chrome is a very different process, that is common today. Be sure you send your parts to a company in the gun plating business. Industrial Chrome does not shine, unless subjected to post treatment polishing measures.
Electroless is a cold process that can be done in your kitchen.
There are as many chrome processes, as there are opinions about politics. Choosing one depends on what you are attempting to accomplish.