He thought about going back and getting the shotgun with the drum magazine.

他考虑回去拿弹匣和霰弹枪。

The shotgun had a short barrel and it was fitted with a pistol stock and a twenty round drum magazine.

霰弹枪有一个短枪管， 装有手枪枪托和一个 20 发弹鼓弹匣。