Mossberg 51M, .22 long rifle cal. semi auto rifle.  Serial #NSN.  Good condition.  20" barrel has a very good bore, missing front sight, adjustable rear sight.  Weaver 29S scope has standard crosshair pattern and clear optics.  80% blue finish that shows some age.  Wood stock with cheekrest is good with some delamination and age.  Metal butt plate.  Has rear sling swivel.  Should be a fun one to shoot.