http://wordnik.i2p/words/single-barrelled
A Sportsman's Sketches 2003 He owned the dozen or so head of puny cattle which grazed in the savannah, a plantation of cassava, some banana and mango trees, a dog, and, unique in the neighbourhood, a single-barrelled , breech-loading shotgun. The Complete Stories Waugh, Evelyn 1998 The only armament, if such it could be called, that it carried was a pair of insignificant little guns, single-barrelled , one mounted for'ard of the bridge, the other on the poop.