I have an 1866 that I have been trying to "distress" or "antique" a bit. Have been working with ammonia as recommended by numerous postings on the net, but could not get it right...splotches, cloth used left pattern, etc. Today I tried something new and...bingo! I poured about a cup of ammonia in an oblong shaped crockpot, laid the brass receiver (still on rifle) across the opening at top and then fabricated a hoop frame of wire coat hangers within the crockpot and arching over the receiver. I then used Glad ClingWrap to construct a "tent" over the hoop frame, with the bottom edges of the wrap readily clinging to the hot sides of the crockpot. I then turned the crockpot to "high" and as soon as the ammonia solution heated up, the patina developed right in front of my (watering) eyes.
I am lightly sanding the super high gloss on the wood to take down the "plastic" look. Also using 1500 paper to take the blueing off the edges of the octagonal barrel and at the bore where wear would normally occur. Have distressed, with fine sandpaper and vinegar, the various screwheads and trigger. I am thinking about going with an Indian rifle look...some brass nails on the buttstock and maybe simulating a stock repair at the grip with sinew and leather. I was at the Museum of the American Indian in DC earlier this year and had the opportunity to observe some incredible Native American weapons. Chief Joseph, Geronimo, Sitting Bull...all were represented with genuine personal weapons. My takeaway? These proud warriors made do with some of the roughest weapons--condition wise--that I have ever seen. Foreget the BS about the enterprising white man selling brand new Winchesters to these guys. It may have happened, but I saw nothing to suggest it.