In the UK, not at all because the quality difference is immediately apparent to anyone with rudimentary knowledge of firearms. Also, they were not imported here.
The fakes certainly caused anger and embarrassment- Greener sued an Australian firm for doing it - never saw a penny in compensation 'though. their impact was largely in the USA and the colonies.
I suppose we see it nowadays with Louis Vuitton luggage and Rolex watches faked in Asia.I don't think it has had much effect but those based in the USA may have mor info on what is easy or hard to sell because of name when quality is the same.
