《天工开物·下篇·佳兵》
鸟枪的射程超过二百步，制法跟鸟铳相似，但枪管的长度和装火药的量都增加了一倍。
鸟枪行远过二百步，制方仿佛鸟铳，而身长药多，亦皆倍此也。
The range of the shotgun exceeds 200 steps, and the manufacturing method is similar to that of the shotgun, but the length of the barrel and the amount of gunpowder loaded have been doubled.