This is a quote from the city of secrets book:
He buckled on his breastplate and tucked his pistol into the shoulder holster beneath his long overcoat. The black powder weapon would have to be kept dry. A lowly corporal could never afford one of those fancy duardin-made wheel-lock guns that kept out moisture –his sidearm was usually a trusty piece, but a sniff of rainwater and he might as well be wielding a loaf of bread.
I think it could be a duardin pistol, based on the above quote.