This Ruger manufactured late variation blue finished barrel band screw with out the slight concave to the straight slot head is for the model 10/22 semi-auto rimfire rifle which uses the alloy barrel band. The overall condition is very good with light wear. (file photo)
Note: Ruger model 10/22 semi-auto rifles with the following serial numbers have been observed with this part:
10/22R: 115-18153
10/22RB: 128-72693
