I went to Ford's website and found the cost of hardchroming the ENTIRE gun in the stainless effect costs $250. For another $45 they would do the ENTIRE gun in high polish hardchrome. The prep work that you did yourself is included in their price.
I'm sure they would not have charged anything extra to glass bead the rounds as this is pretty standard. And yes, I have used Ford's many times for complete guns.
So other than doing black nickle on your small parts, your $240 shows very little saved compared to the sending off the gun, with a check for $250+ and your instructions.
Other than the self satisfaction of prepping the gun that Ford would have done for you anyway.