These are surplus 9mm UZI bolts . They are for a full sized 9mm UZI sub machine gun with out the semi auto barrel restrictor rings. They are NOT slotted to clear the semi auto blocking bar. These Uzi bolts do not come with the extractor, extractor retaining pin or the recoil spring assembly. They will work in any full sized Uzi SMG without a blocking bar or barrel restrictor ring.