This Remington manufactured early variation bolt assembly includes the bolt, extractor assembly, and firing pin assembly and this early variation bolt will have one of two variation pivoting blocks on the left side (see second photo). This bolt assembly is for the early model 572 Fieldmaster slide action rimfire rifle and will only work with the early variation action bar. The overall condition is very good with light wear. Note: on the second photo the upper breech bolt is a 1957 manufacture and the lower photo is a 1955 photo but both will work properly with the early variation action slide. (file photos)

Note: Remington model 572 Fieldmaster rimfire rifles with the following date codes (month and year of manufacture) have been observed with this part:

Upper Photo:

Bottom Photo: BB (January 1955), AB (March 1955), CB (April 1955) & WD (August 1957)