Simple barrel vise for M24 or similar taper contour barrels. I prefer to clean my barrels when removed from the action. Clamp this to a workbench to hold the barrel while cleaning. I doubt it could clamp hard enough to torque the barrel onto an action with.

Print this with a high number of top layers and moderately high walls/infill for full strength.

Note the photos show a personalized version. The files included here do not have the personal logo.

I recommend using this combined with my Barrel Cleaning Tray meant to insert over the 5/8-24 threaded muzzle and Piloted Bore Guides:

Rifle Barrel Cleaning Drip Tray - 5/8-24 by AngelicAnarchy - MakerWorld

Bore Guide w/Pilots for 1-1/16in Shank Barrels by AngelicAnarchy - MakerWorld