This Ruger manufactured pistol grip hardwood (Birch) stock with synthetic butt plate is for the model 10/22 semi-auto carbine in 22LR caliber. The overall condition is very good with light dings and handling marks. A sling swivel stud may have been added. (file photos)
Note: Ruger model 10/22 semi-auto rifles with the following serial numbers have been observed with this part:
10/22RB: 128-72693