I'd lightly dremel the bottom of the tenon. If it is post 1988 then it will be the wide tenon, instead of narrow.
Not sure the vise/rocking method would be advised on the wider one and the vise/rocking will be required even with some dremeling.
You will want to have a bit of relief into the slide, which should already be there, so that the staked material has some place to go instsead of interfering with the bushing. A little bit more won't be a deal breaker as long as you don't go totally nuts.
Take your time tapping the metal with the right swaging tool when replacing. Pretty DIY freindly job, with the right tools.
R