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And they didn’t just support it, their lawyers wrote the entire act.
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The NRA supported and opposed parts of the Gun Control Act of 1968, which broadly regulated the firearms industry and firearms owners, primarily focusing on regulating interstate commerce in firearms by prohibiting interstate firearms transfers except among licensed manufacturers, dealers and importers. The law was supported by America's oldest manufacturers (Colt, S&W, etc.) in an effort to forestall even greater restrictions which were feared in response to recent domestic violence. The NRA supported elements of the law, such as those forbidding the sale of firearms to convicted criminals and the mentally ill.
Again, I think your claim is a stretch, if not flat out wrong. If you can bring something to the table that supports your claim I will give it further consideration.