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The trick is to remove the slide from the frame and put it on a FIRM surface so it doesn't bounce or move and dissipate the force.
I have put a magazine or sheets of newspaper as a pad on a concrete floor for stubborn sights or pins.
Second, use a BIG brass drift. I made mine from 1"x 1/2"x 6" brass bar stock.
A drift that size won't flex or bend and spread the impact force.
It helps if you have someone to help hold the slide steady so it doesn't move or try to roll over when struck.
Years ago someone sold an impact drift with a nice design, so I made my own.
Buy a cheap automatic center punch from a hardware store.
Stone the tip flat and braze a glob of brass to the tip.
Put the point on the sight and press until the automatic punch "fires".
The impact will move the sight.
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