JB weld?  epoxy?  the blocks on the barrel.   I'd try it on a old barrel first.

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This will work, but the heavier the scope, the greater is the possibility that the epoxy might suddenly let go--which happened to me, and it was mighty distressing.  If the scope is only attached when shooting at a range, this danger is minimized.

But I had no trouble removing the epoxy residue without harming the blue by using heat & lacquer thinner.

Steve Earle makes a bar that is 8" or so long with holes for the bases drilled and tapped in the bar on a spacing of 7.2".  I got a few.  I just use Acraglas colored black to attach the bar to the barrel and away I go.  I've never had one let go.  But I never have my scope on the rifle until in is in the rest.

When and if you want the bar off, give it a whack with a mallet and it is off.  Removing any glass still stuck to the barrel is an easy process.  Can't make myself drill and tap an original barrel.
Phil

If I was mounting a Unertl with a glued on bar would add a couple of zip ties as insurance. Fly off and break cost big bucks.

Boats

Rare earth magnets are fine by me, but I can see some discussion forming about the molecular structure of the barrel's frisben surfaces contaminating the fluid dispersal of the sludge orbits in the powder residue off to the side, where it'll do the most harm. This, of course, is not much trouble to the offhand shooter in a wind storm on a sub-freezing morning, but can disperse the anti- coagulants on the lower barrel lands while shooting off the bench. Makes the bullet fly different if the lube contains iron shavings or Hershey's milk chocolate. Of, course, there could be some more serious reasons to avoid magnets, but I haven't explored all the facets of this. 

If the targets are at magnetic north shooting lead bullets,  none of that will matter.  Of course shooting copper jacketed  bullets through a magnetic field will certainly disqualify the shooter since the resulting high voltage bullet would be an electrical device and they are barred for use in the rules.  Should be ok for electrocuting varmints, deer and other game animals.  Should be a great advantage in winter to have a hot meal precooked when the skinning is completed.

Mine is  nonferrous