Oh, to live somewhere rational on the issue of suppressors. 
NC is NOT!!.
Mac.
This is something that's been bugging me, Suppressors are regulated under NFA, a FEDERAL law, if you pay the tax and do the paperwork FEDERAL govt. says have fun. How can a STATE over ride FEDERAL law and say no ?
MB, I've been thinking about this since I first read your "turd post",You wrote "Does the fact that virtually every Colt Gold Cup will eventually snap the roll pin that holds the rear sight in place and launch the sight into the heavens — something that has been common knowledge for decades — make Colt Gold Cups turds?" the answer to that is YES. granted things made by men fail, however if they consistently fail in the same fashion it is a design flaw that could and SHOULD be fixed. ESPECIALY if it has been common knowledge for decades. I realize that production machining is not your thing, you shoot guns, help design guns write about guns, but you do not manufacture, guns or anything else of the sort so here goes. In manufacturing they have what is called "the corrective action process in quality control" The whole process is summed up by any 3 year old, WHY? Why were these items sent back? Because the rear sight came off. Why ? because the roll pin snapped. Why? OK I don't know why the roll pins snap so I'll skip to the next question, Can we fix the problem ? Yes, since the problem is holding 2 parts together we have options such as drilling and tapping to add a screw to existing items or a tack weld even. The next question in the process is can we prevent this from happening again ? Again since the problem is holding 2 parts together the answer is yes, redesign the sight mounting system to be stronger and either do away with the roll pin or retain it only as a secondary method of retention as it is not enough by itself, Such redesigns might be using a dovetail, or a larger dovetail, possibly using screws to attach the sight instead of pins. Since I don't specifically remember ever seeing a Gold cup I really can't give detailed info on the fix, but I think you get my drift. If a mass produced item consistently fails in the same manner YES it is a turd, it may be one you can work with as in this case, but it is an engineering failure that a company can and WILL fix if it respects its customers.
Unfortunately, to many companies take the attitude of the 19th century robber baron (railroad tycoon, I forget which one ) who said "Damn the consumer".