I'm not sure which update caused this to happen, but at some point during the last two or three years, the volume of the firing sound for the VLAD nailgun was massively decreased. The nice "CLANK" noise it makes was so much more louder at one point, and now it's barely audible when firing. It's especially noticeable if you compare it to the volume of literally any other gun, making a very jarring difference. I asked around on Reddit and I'm not the only one who's noticed this bug. I thought I was crazy at first, but yeah. I don't know how this one went under the radar for so long! Would absolutely love a fix.