Yes. I have two 6 1/2" Thompson/Center Association barrels, 1 in .22LR, and 1 in .44 Mag. and have enjoyed them. I wish I had one in .45ACP.
Received as gifts, I also have 3 SSK barrels: a 6 1/2" .45-70 (!!!), a 5 1/8" .480 Ruger, and a 5 1/4" 7.62x25mm Tokarev, which runs an 85-87 gr. bullet @ 1600-1625 fps from that short barrel ! Those barrels shorter than 6 1/2" require shortening a fore-end, which I have done.
All these barrels except for the .45-70 are wearing red dots, mostly the Ultra Dot, with a Millet on the Tokarev. I've used the .22LR for squirrels, and plan to use the Tokarev on an occasional close groundhog, but haven't done it yet. The .45-70 was a bear to develop loads for, but is presently set up for hogs, wearing a 2X Leupold. The original Ultra Dot failed on it.