https://www.rockislandauction.com/detail/1028/6312

While rifle-launched grenades date back hundreds of years, they first came into widespread use during World War One, on all sides of the conflict. The first years of the war saw the use of rod grenades, but their downsides (mediocre accuracy, bulkiness, and a propensity to damage rifle bores) led to the British adopting a 2.5” cup grenade discharger in late 1917. This new launcher used slightly modified Mills bomb hand grenades, and could launch them with significant accuracy from 80 to 200 yards. They would become a staple of WWI combined arms infantry tactics, and be used clear through WW2 until replaced by the 22mm NATO style spigot grenades.

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