I just finished building this NorthWest Trade Gun at the request of a friend. The unmarked .62 cal. barrel is believed to be a Colerain and the lock is a Davis Trade Gun. This was my first experience using a Davis lock and I am not favorably impressed.
The first issue - likely an assembler issue - was an ill fitting sear spring that had to be modified. All in all, a minor issue.
The second, and much more serious, issue was an excessive difference in sear bar heights at rest, half cock and full cock. The lowest setting was at half cock, which made for a very sloppy trigger at rest and full cock. The answer was a spring to keep the trigger in contact with the sear, which took some pondering since I could see no obvious place to put a spring. This gun does not have a trigger plate. The answer was a small piece of L-shaped .020" music wire tucked into the mortise for the sear bar. That is probably old hat to those with more experience.
The third issue was flint size. According to Track, this lock takes a 1" x 1 1/8" flint. That flint is too large and a 7/8" x 1" flint looks about right. Unfortunately, the owner jumped the gun and ordered fifty 1" x 1 1/8" flints before I got the gun built
. There shouldn't be any problem finding a home for them.
Prior to this build, BLO was my go-to finish. I used pure tung oil on this one and prefer it over the BLO.
Enough whining already! All in all, it was an enjoyable build and another learning opportunity.
Suggestions and criticisms are most welcome
By the way, before someone points it out, I know something has to be done about those three shiny screws in the lock. I dressed them down while in the lock and on the gun and didn't want to disassemble the lock just to fire-blue them, or risk damaging the finish on the plate by using cold blue. Looks like I will be partially dis-assembling the lock
.