Ten Ring brings up a good point, reinstalling the pin in the same position is essential, otherwise the barrel won't fit the same as one member here learned the hard way, he had to send it back to H&R to be fitted again.
Gardner refinished frames and barrels, I suspect Ilion does too, I just don't know how much they charge now, it was $35 in 2007 as shown on the retail parts sheet below, you'd have to call Madison or PM Brian56 for current price and details.
Tim