just acquired a 77/17 variation tha I've been looking for a while now. Varmit/laminate version with high gloss stainless finish instead of the target gray. Upon arrival and inspection the barrel measures only 20 inches instead of the standard 24 inches. My concern is the barrel is a replacement and not original. It does have the warning rollmark and the caliber marking and they appear to be factory.Would Ruger records be able to help or does anybody have any input on this matter?