shootist

noun

1. (US, archaic)A person who is an expert user of firearms, especially a sharpshooter or a gunslinger in the Old West.

   “Not being a "shootist," I cannot lay the bird before you.”

   “Such terminations in -ist were very common at one time; my collection includes swimmist, sparrist, ballist, walkist, shootist, saloonist, and several others.”