Ruger Model K10/22 RB, .22 long rifle cal. auto-loading carbine.  Serial #237-68687.  Excellent condition.  18 ½” stainless barrel has excellent bore.  Barrel and receiver have 97% stainless finish.  Hardwood stock is excellent.  Stainless trigger guard has some marks.  10-shot rotary magazine.  In original box with instructions.