Black locust would make a great over the log gun stock if you can get a log big enough w/o rot. Black locust is a transition tree, found in disturbed places, where it serves to reclaim a deforested or bare area until more "climax" trees can take over. As such, it has a medium lifespan and they start to rot or get "pethy" around 40-60 years of age. It does make great bows; I have made a half dozen and it is my favorite, even over osage. Also known in some areas by lumbermen as "pi$$ oak" because of it's color and toughness, it makes great floors. There's nothing fancy about the grain; the "figure" looks like plain hickory. There are many reasons some gunstock woods were preferred over others. In my estimation, abundance of large, tall, straight-trunked trees is a very important criteria our forefathers used. Of course the wood needed to be stable, strong, have some shock resistance, be of a certain weight range, reasonable to work, and ideally have some beauty. Black locust is markedly more dense than sugar maple, which is the densest common stock wood used for longrifles. I'll probably make a rifle of it someday, right after my hickory stock, lol.