For the first, no, BC isn't all there is.

For the second, if you use BC products to try to do an entire gun, it will look like crap.

The only cold blue that has a prayer of looking decent, IMO, is Brownell's Oxpho-Blue. Best cold blue on the market, and, unlike BirchwoodCasey stuff,is suitable for other things than touching up screwheads. Go here to look at it:http://www.brownells.com/aspx/NS/store/catsearch.aspx?k=oxpho+blue&ps=10&si=True

Another option is Blue Wonder, not a really a "blue", as I understand it, it is actually a photo-chemical process. It does work, and works quite well. Go here to look at it:http://www.bluewonder.us/index.html

Neither of these will take the place of a highly polished, hot caustic salt blue finish, but they are both very servicable finishes.