This Ruger manufactured firing pin retaining pin measures .093" x .565" and is for the model 44 semi-auto carbine. This retaining pin is in very good condition with light wear. (file photo)

Note: Ruger model 44 semi-auto carbines with the following serial numbers have been observed with this part:

No Prefix: 61450, 64382, 66427, 95121, 107880, 114926 & 133610

100 Prefix: 100-09871, 100-13353 & 100-36694

102 Prefix: 102-06552, 102-23818, 102-51716 & 102-67115