It's nice to have a dot on the wall across the room. Look down the bore and center the dot in the bore. Then look at where your front sight is pointing through the rear sight. Does this confirm the point of impact being off?
i boresighted the rifle at 20' and this confirmed the loe/left results at the range.
Do this before heating it up with a torch. Leave the rifle in the vice when you heat it up. A little bit goes along way.
If it will not turn you will need to remove the eye for the front sling mount and adjust sight and redrill for a new sling eye. Just curious, does the cocking tube have a hanger on the end for the handguard?
yes, the push-pin bracket for retaining the handguard is welded on the free floated cocking tube.
If so, see how concentric the cocking tube is into the triple frame. There should be the same sized air gap around the cocking tube tip.
the tube and sight ring 'look' to be concentric, but i am hesitant to gauge anything off of the cocking tube...it moves around too much to serve as a point of reference.