Changing the link is a cheap but poor way to resolve a poorly fitted barrel, if that is the problem. The link's function is to pull the barrel down and out of engagement with the slide. The lower barrel lugs, sliding on the slide stop pin, is how the barrel is supposed to be pushed up into engagement with the slide.
The pistol shooting beyond the adjustment of the sight could be a barrel fitting problem, or rear sight problem, or rear sight dovetail problem, or front sight problem. How I'd resolve the problem would depend on how its shooting. If it is consistently accurately, I'd look to changing something on the sights. As mentioned, a higher front sight will solve the problem. So might a lower rear sight, if the rear blade could be modified. If the groups are not consistently good when using quality ammo, then I'd look to replacing the barrel.