The term GUNLOCK CATCH is composed of two crossword solutions, SEAR and 4 letters. A SEAR is a part of a firearm that holds the hammer or striker in a cocked position until the trigger is pulled. The 4 letters refer to the catch, which is a device used to hold a door, window, lid, or other object in place. Together, the gunlock catch is a safety device that prevents the firearm from being fired until the catch is released.