The Werndl-Holub M1867 was an Austro-Hungarian breechloading rifle designed by Josef Werndl and Karel Holub. The M1867 was the first sucess for the Steyrworks, which had already began converting older Lorenz Rifles to breechloading firearms.
The Werndl-Holub M1867 was built around the breech loading mechanism designed by Werndl. This mechanism featured an easy to identify rotating drum action, which is allowed to rotate when the hammer is moved. When the hammer is pulled back, the drum can be rotated with the flat lever (located on the drum) to allow acess to the rear of the barrel and breech to load a new cartridge.
The M1867 also borrowed features from older designs, with the firing pin mounted within the block, offset, similar to the Snider Enfield and early "Trapdoor" Springfield rifles. The location of the firing pin allows the block (with the pin recessed in the block) to pivot within the receiver, resulting in a smoother action. Likewise the sights were copied on the Argentine M1879 Remington Rolling Block rifle.
The M1867 fired one of two cartridges, depending on when it was used. Originally, when the Infantrie (Infantry) or Jager Gewehr (Riflemen) were using the M1867 then the 11mm scharfe Patrone M.67 (11.15x42mmR) cartridge was issued while later the standard issue became the 11mm scharfe Patrone M.77 (11.15x58mmR) which was bottlenecked.
The Werndl-Holub M1867 replaced the Wanzl rifle (which itself was simply a conversion of the Lorenz rifle) which had been designed following the dominance of the Prussian Dreyse Needle Gun during the various conflicts of the mid 1800s. The M1867 was replaced in 1888 although the rear-echelon of Austria were equipped with M1867s until the end of the First World War to better equip frontline troops.