Toilet bowl cleaner will do the job in a pinch. I forget the brand name.i coulda used paint stripper, but didn't have any.
Thank You Gizzy!!!!!!All you do is take the V-Block off, put the screws for the V-Block back in, set the V-Block against the screw heads with the V-Block in backwards. Now just unscrew the v-block screws and the v-block will press the barrel out. No need for screwing the barrel or soaking in Kroil.
Thought id chime in as what worked for me also. This is exactly what i did with my brand new 10/22 carbine i sprayed a little clp oil before putting the action end in oven with most of barrel sticking ing out of oven. I closed the oven door about 3/4 way and had oven at 400 for about 15 minutes. Put on oven mits an removed from oven and tapped on reciever while hoding barrel, was fairly easy and barrel was off with under a minute of tapping.Aluminum expands much more than stainless or steel, So Id put the action end in the oven on at the lowest temp for about 15 min, probably with the oven door open. You can even add a few drops of oil while heating