I like the old time feel you created here. Good composition. To me, this one really stands out of the bunch. Copping is tough here, but I think I'd take out a bit at the left. The right side just seems to drop off.
I'm partial to black and white images, but this is also a great shot! There is certainly an age to it, it almost has a gritty feel. It's not supersharp, but I dont think that distracts too much, it's more of a mood thing. I like the fact that you included some of the front of the table to partly frame and actually make it seen that it's a table, so many people would have cropped that out. I find it interesting to look around and single out a few of the tools - the old rifle, what appears to be a tin mug - they all blend together as a collection well, but they also let you explore inside the image too, which to me gives it more value than something that can be admired in two seconds. The contrast, which is so important with B&W is great.
I think simply calling it "Gunsmith" would have been better. Might have tried cropping a bit more of the left and bottom. Nice grayscale though and certainly meets the challenge.