So, the .45s are unique in the way they interface with the slide lock. That is probably due to the relatively large bullets and limited space. The engagement between the follower and the slide stop is minuscule compared to the other Kahrs. That is why the pin that engages it is machined and projects a bit past the plastic follower.
Anything can be addressed technically. The solution is to get steel (or stainless steel) in there that is shaped in a way to be sure to engage the slide stop and tough enough to stand up to the small area of engagement. Greg had the great suggestion of using a screw in the follower where it engages the slide stop. Because of the shape required to engage the slide stop, a regular, round head doesn't really work. So, it would take a custom pin or screw that has to be indexed into a certain orientation for even that to work.
The business issue is that any solution, like making the whole part from stainless, adds to the cost significantly. The other issue is the .45 parts don't sell well. Over the same time frame, I sell almost 40 9mm followers for each .45. If the price goes up, even fewer .45s will sell.
So, the business solution is to just obsolete the part, happily offering refunds to anyone who wants one, and putting the current inventory in the recycle bin. That said, I would like to hear opinions.