If I may add my two cents...
I happen to own the Confederate Handguns book by Albaugh, Benet and Simmons, as well as the Dance Brothers book by Gary Wiggins, the Dances chapter from the Texas Gun Lore book by Holloway, and articles from The Gun Report, Heritage Arms Magazine, and the American Society of Arms Collectors about the Dances & Brothers revolvers.
From these reads, it appears that the workers at the mill were not slaves but members of the Dance family (brothers and cousins) and soldiers discharged because of their skills.
About the lack of recoil shield on most revolvers, no sure reason could be given. Gary Wiggins writes on page 139 of his book: "A close examination of the unfinished frames unearthed at that location (factory site in Anderson) reveal that they were cut out of flat iron bar stock, approximately 1 3/8" thick."