You make an interesting post. I have three fast twist drop in 45 cal barrels. One is a 15/16" 1-30 twist stainless steel barrel. It is marked LRH. I have another one that is the same but it is 1" and it also says LRH.
My last one is a blued barrel 32" long it is a 1-18 twist it only says 45 cal.
I am don't have all the answers for you but it does seem that yes some of the fast twist 45's were not marked LRH.
This one is a LRH.
The Blued gun just says 45 cal.
