"Shade-tree" Gunsmiths have found that if they bend the trigger guard it alters the 'pull-off', rather than doing it properly, it is a 'bodge' than can be done with a pair of pliers and a screwdriver.
Peter Laidlermade mention of it in one of his 'presentations' explaining that it must be 'flat' and touching the forend throughout its length.
Extract :
The trigger guard should not spring at the rear or front….., NO it shouldn’t! If it was meant to, it’d be made of spring steel!