Yes, the bolt stop pin, the had to modify it at the top to clear the sights screw they also installed. They had to remove half of the top of the pin. There is little of the original pistol left, barrel, sights, trigger and others stuff too. The gun was done at least 15 years ago.
Clark Custom was more than willing to fix the problem, they were trying to save me the shipping costs which as you know are high because of the overnight shipping required because in not an FFL. They even tried to talk me through the assemble since they weren't sure it was just me not knowing how to do it. They were extremely nice and helpful.
If I can't find anyone locally soon I'm going to have to send it to them.