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A falling-block action (also known as a sliding-block or dropping-block action) is a single-shot firearm action in which a solid metal breechblock slides vertically in grooves cut into the breech of the weapon and is actuated by a lever.
Rifles using this action include the M1870 Belgian Comblain, Mylonas rifle, Sharps rifle, Farquharson rifle, 1890 Stevens Arms, Sharps-Borchardt Model 1878, Winchester Model 1885, Browning model 1885, Browning M78, the Ruger No. 1, and the Ruger No. 3. Falling-block action military rifles were common in the 19th century. They were replaced for military use by the faster Bolt action rifles, which were typically reloaded from a magazine holding several cartridges. A falling-block breech-loading rifle was patented in Belgium by J. F. Jobard in 1835 using a unique self-contained cartridge. A falling block pistol was also produced in 1847 by the French gunsmith Gastinne Renette who would file another patent in 1853 in France and through the patent agent Auguste Edouard Loradoux Bellford in Britain for the same system only using self-contained metallic centerfire cartridges.
As well as being used for artillery, falling-block action rifles are still manufactured and used for hunting and target shooting. This also includes 8 gauge industrial shotguns for shooting clinkers or slag built up inside industrial boilers or furnaces.
The falling-block action is closely related to that of the Martini–Henry rifle, the Peabody action (similar to, but not identical with, that of the Martini–Henry), the Ballard Rifle, and the Madsen–Rasmussen (uniquely, a repeater), which use a pivoting rather than a sliding block.
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