Yes...it will be interesting to see if the Supreme Court thinks baking a cake for a wedding reception the bakers aren't even going to is the same as participating in the wedding itself.
That would certainly open the door for claiming that manufacturing and selling a gun is participating in a mass shooting.
That is one of the dumbest logical leaps I have seen on this board, "SHE WHO MUST NOT BE NAMED' level dumb.
The issue in front of the court is if a custom made cake is a form of expression covered under the 1st amendment, attending the event or not was not part of the case being presented.
While the gun participated in said theoretical crime, it's similar to not suing the car manufacturer when a drunk plows into someone in their Ford.