littlesister, the barrel block is 5-6 inches long and carefully bedded into a cutout in the stock. No pivot, they do it to BR centerfire rifles. The trick is fitting the block to the barrel.
justin, did you just glue the barrel into the stock? How much of the barrel is glued in? With the no recoil of the 22rf, that would work without a block. Now.... did it shoot better? Did you leave the action screws out completely?
brianf, never thought about the action vibrating along with the barrel......HUM!! I saw it done to 260AI F-Class, guy called it a 6.5 Mystic. Guy did it with a Savage 200 action, trying to keep cost down. It was competitive.