Several of the guys here have done what you propose and say that the Black Loc-Tite works well. You need to mate up the barrel and sight base with as much surface touching as possible. They way to do that is to wrap a piece of emery cloth around the barrel with the smooth side to the barrel. Just work the sight base forward and back on the emery cloth until you get the base to match the countour of the barrel.. Make sure both surfaces are clean and free of oil and dust. You want to also trace out the area on the barrel where you want the sight base to be mounted and take off the camo or bluing so you are glueing bare metal to bare metal, then follow the directions on the loc-tite. It's not hard, just go slow and don't take off any more material from the sight base than necessary to match the contour of the barrel.
Good Luck and enjoy the new Pardner.
cookiemann