You are asking for a different barrel style then what is discussed here, LTV barrels are not the SS Hammer Forged barrel being asked about. Ruger may have issues selling that style without "fitting it" to the rifle, ask them why and let us know
Shows you can have a 20" SS target barrel for $120 from "shopruger.com", That ebay ads marked it up $50 more than shopruger, both show stock. Let us know who you go with and details.
