From Longman Dictionary of Contemporary Englishmarksmanmarks‧man /ˈmɑːksmən $ ˈmɑːrks-/ noun (plural marksmen /-mən/) [countable] PMWsomeone who can shoot a gun very well
Examples from the Corpus
marksman• A marksman was called in to try and hit the enemy's machine gun post.• As an expert marksman who is sponsored by Colt Firearms on tour, he often is.• And the 22-year-old marksman saved his best for last.• This was actually rather brave considering the police marksmen lining the roofs!• Police marksmen surrounded the building.• Six marksmen were chosen, one as a backup.• Billy stood there politely, giving the marksman another chance.• It was his addled understanding of the rules of warfare that the marksman should be given a second chance. 