It may seem unlikely, but H&R kept several parts compatible across several model changes so this swap may actually work. I have not researched the parts differences between the 999 sportsman and the 622 but both were available at the same time. I would look for a 999 "parts" gun and try it! Let us know if this works.I was given a 1957 622 with a 6" barrel a while back. It's the basic pull-pin cylinder model. Built like a tank- but the grip is really too small for me. I wonder if the trigger guards are swappable- the one with the web to relocate your grip looks like it might help.
This style-
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This is mine-
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I should have given you pictorial credit. My bad. Sorry.You're welcome.
There's a few on EBay too. I may just take a chance.It's for the 939 from my previous post
It's worth a tryThere's a few on EBay too. I may just take a chance.