You remember November 2, 1976? The state ballot measure to flat-out ban private ownership of handguns completely? (Yes, with no grandfathering!!11!!) The measure that had the usual "overwhelming public support" and that everybody thought would pass, with other states watching intently and ready to follow suit?
GOAL was started to oppose that. GOAL succeeded. It went down in flames, like 70/30. Arguably the whole country owes GOAL one for that.
So, yeah, I hate the state of things, but if you're going to talk 50 years you can can find one hell of an outright win. I do believe they've done a lot of good since, but it's backroom deals and influence and not stuff in the public eye because that's how shit works here.