Re: H&R Sportsmqn Single Action
Closest thing I can find are on page 749 in the 25th Anniversary Edition of the Blue Book, listed under "Handguns: Pre-1942"
"SPORTSMAN NO. 199 - .22 LR cal., 9 shot, single action, 6 in. barrel, adj. target sights, break open, blue only, checkered walnut grips"
"ULTRA SPORTSMAN - .22 LR cal., 9 shot, single action, 6 in. barrel, blue, break open, adj. sights, walnut grips, short cylinder action, wide hammer spur."
No mention of a barrel rib......
Those are the only single action, break open 22s that I see.