Chuck, For gun parts, which I consider small pieces, I prefer a small gas forge. The main reasons are quicker heating, steady heat, and you won't burn up small items like a coal forge will do. The one I use is kind of a home made job I bought on ebay, that's made from an old freon tank with two jets. It makes a little over 1200 degrees and will let me do everything I need to do, include brazing. Search under blacksmith on fleabay. think it was under $200, and included instructions, and regulator. I also use coal for bigger stuff, but it takes more work, and practice, and coal can be a problem to get in some areas.
Bill