This Remington manufactured early variation breech block assembly with a checkered spur and firing pin is for the earlier No. 4 single shot rolling block rifle in 22 rimfire caliber and is in very good condition exhibiting a dark brownish gray patina with a few specks of rust. (file photo)

Note: Remington No. 4 rolling block rimfire rifles in 22 caliber with the following serial numbers have been observed with this part:

22 Rimfire Solid Frame: 42532, 44993 & 141404

22 Rimfire Early Takedown Frame: 159261, 162817, 233272, J256749, J290872 & J775577