Looks like they have a limited run of the 1S in two more pistol calibers - 460 S&W and 475 Linebaugh. Both have 20" barrels. I don't have a need for one, but I guess that hunters in some states that allow pistol cartridges or shotgun slugs only might want them.

https://www.lipseys.com/itemde...spx?itemno=RU1S460SW