This Marlin manufactured first variation breech bolt Assembly is for the early model 99M1 semi-auto rimfire rifle without hold open feature and is in very good condition with light wear. This assembly consists of the first variation breech bolt, cartridge lifter roller, first variation firing pin, firing pin retaining pin, and the complete extractor assembly. (file photo)

NOTE: Firearms with the following year/serial number have been observed with this part:

N.S.N. - (KH) November 1964