noun
ejector housing (firearm)
Technical term for the part of a rifle or pistol that houses the ejector mechanism. Extremely specialized; not used in everyday language.
See also: 排莢桿筒
この銃の蹴子覆は簡単に取り外せる。
The ejector housing of this gun can be easily removed.
Compound of 蹴子 (ejector) + 覆 (cover/housing). The exact derivation is uncertain; likely a coined technical term for firearms.