Thank you AJ. I bought the cock, top jaw and top jaw screw from Chris Hirsch. I used them on a L&R late English lock.
It is a.50 caliber barrel. The striping didn't take as long as I expected, just start in boldly with the brush. I did stripe it twice, once with a medium brown alcohol based stain followed by narrower stripes in a darker shade. The base stain is aqua fortis.