If it's that bad, check for a cross-screw, secure it in your bench vise and carefully cut a slot down the center of the sight base. Just before you touch the slide, the sight will collapse on itself and drop out.Been banging on it, but she aint budging thus far.
When holding the pistol as if sighting on the target, the sight will push out from the left to the right. And in the opposite direction to install. Common industry practice.Take a soldering gun or micro torch to apply heat till it smokes to break the loctite down. Then remove. Note, some sights go in and out only 1 way. Need to find out the correct direction for your gun. A sight pusher may be better than a punch on apply load. I've done them both way.