A single-shot firearm action in which a solid metal breechblock slides vertically in grooves cut into the breech of the rifle and actuated by a lever.

A wooden block built into the interior of a wall or floor, running perpendicular to stud and joist cavities, especially in balloon-frame construction, intended to inhibit the spread of fire within stud and/or joist cavities.

plural of gapers' block

gauge block

Misspelling of Johansson block.

plural of gauge block

plural of Johansson block

A precision-ground template used for the calibration of mechanical measuring devices.

plural of hat block

a block on which hats are formed or dressed