This Stevens manufactured early variation breech block assembly is for the early Crackshot-26 single shot lever action rimfire rifle in 22 LR caliber which uses a screw to hold the breech block to the receiver and is in very good condition exhibiting a brownish gray patina with light wear. This breech block assembly consists of the breech block, breech block plunger, breech block plunger spring, firing pin and firing pin retaining pin.  (file photo)