Rubbers degrade too fast on those. Don't know what the Chinards use on those now, but I can't get them to last on the shelf or in the truck very long. When I grab one, I get a broken sling.
As a kid, I had the Wrist Rocket, like the B52 but fixed brace. I was deadly with it. Killed a big cottonmouth on the other bank across the creek one time. But those two, the rubbers don't last long.