Those short bases for the front site beads on Remington plain bbls are silver (hard) soldered on,,at least the ones I've taken off.
Plenty of heat needed to remove them.
I always put them back on a shortened bbl w/ soft solder. A sweat soft solder job done right does the trick and if you're careful you don't spoil the blue on the cut down tube.
If you are cutting back to something like 22" from a 30 or 28",,you may be able to elliminate the base all together as the bbl diameter is a little larger back there. That gains you some of the heigth.
A larger diameter bead could make up a difference. The latter could be of help to a younger shooter too.
I know we're not supposed to look at the front bead and all that, but,,,,
Just my .02
