This Marlin manufactured military type ring cocking knob and striker assembly is for the Glenfield model 100G bolt action rimfire rifle and is in very good condition with light wear.  This assembly consists of the military ring cocking knob, cocking knob pin, cocking knob spring, striker, striker pin and striker spring.  (file photo)

Note: Marlin Glenfield model 100G rimfire rifles with the following year/serial number have been observed with this part: