to assemble the Fastguns. The first one went together without any problems but when I attempted to tighten the last nut on the threaded rod (which is supposed to be a 1/2" nylon lock nut) I discovered that an incorrect 1/2" nut, not a lock nut, had been included in the hardware pack instead. When I opened the other box, containing the other 2 Fastguns, it also had 2 incorrect nuts.
you brought up MISTAKES do you see your own ?
Fastguns don't use nuts> you did the very same thing that happened to the assembley worker, you missed a fine detail.