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Another muzzleloader conversion similar in concept to the Allin action was the British Snider-Enfield, also introduced in 1866, which hinged to the side rather than forward.

Unlike the US Army, which kept its trapdoors for decades, the British soon moved beyond the Snider to the more sophisticated dropping-block Martini action derived from the Peabody action.

Martini-Henrys were the standard British rifles of the late Victorian era, and Martini-Enfield conversions continued in second-line service until the Second World War.