Firearm frame or receiver definition

Firearm frame or receiver means that part of a firearm which provides housing for the hammer, bolt or breechblock, and firing mechanism, and which is usually threaded at its forward portion to receive the barrel.
Firearm frame or receiver means the part of a firearm that provides housing for the hammer, bolt, or breechblock and the firing mechanism and the part that is usually threaded at its forward portion to receive the barrel.
Firearm frame or receiver means the part