Courtesy of Researcher, who knows
https://www.remingtonsociety.org/forums/viewtopic.php?t=24030and
https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=611267&page=3It may have been a year or two after the introduction in the fall of 1931 that the solid rib was available on the "Standard" Grade 31A, but it (and the VR) were offered on the Trap Gun.
This is a catalog listing from 1935
![[Linked Image from photos.smugmug.com]](https://photos.smugmug.com/Vintage-Sporting-Ads/RemingtonUMC/i-66MxgkN/0/7c8d4215/XL/1935%20Model%2031A%20and%20TC-XL.jpg)
The 31L (Lightweight)
https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=66618