This Marlin manufactured fourth variation breech bolt Assembly is for the model 99M1 semi-auto rimfire rifle and is in very good condition with light wear. This assembly consists of the fourth variation breech bolt, cartridge lifter roller, second 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:

1974: 26445526