This Mossberg manufactured late variation pistol grip walnut stock with cheek rest and spare magazine storage compartment is for the model 42M bolt action rimfire rifle which uses the slightly longer trigger gaurd with a flat end at the bottom and is in very good condition with light dings and handling marks. The late variation stock is designed for accepting a magazine stock plate and is also designed for the S100 or S130 receiver peep sight.  (file photos)