This Remington manufactured late variation breech block with a serrated spur is for the later No. 4 and the new model 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 new model 4 and No. 4 rolling block rimfire rifles in 22 caliber with the following serial numbers have been observed with this part:

22 Rimfire Solid Frame:

22 Rimfire Early Takedown Frame: J313458

22 Rimfire Late Takedown Frame: 331072