This Ruger manufactured early variation scope base hole filler screw with a shoulder stop is for the model 44 semi-auto carbine and is in very good condition with light wear. (file photo)
Note: Ruger model 44 semi-auto carbines with the following serial numbs have been observed with this screw:
No Prefix: 61450, 95121, 114926 & 133610
100 Prefix: 100-09871, 100-13353 & 100-36694
