In the United Kingdom, however, shotguns must have a minimum barrel length of 24" to be eligible for ownership on a Shotgun Certificate, and shotguns with barrels under this length (which includes Coach guns) must be obtained on the more stringent Firearms Certificate. Some modern coach guns feature internal hammers as opposed to the traditional external hammers.
In the United Kingdom, shotguns need a minimum barrel length of 24" for a Shotgun Certificate and require a stricter certification process for shorter-barreled models (such as coach guns). Modern coach guns often use internal hammers instead of traditional external hammers.