This Remington manufactured trigger housing assembly is the early variation with the smaller sear, lack of cut out in the right side of the housing, early safety, and safety screw instead of the retainer pin. This early variation trigger housing assembly is complete needing only the mounting (housing) pin and is for the model 581 bolt action rimfire rifle. The overall condition is very good with light wear. (file photo)

Note: Firearms with the following serial numbers have been observed with this part: N.S.N., 36399, 43250, 1004015, 1111092, 1125320, 1149412,1185309. & A1039582