One could make a very strong argument that gun owners played a big part in getting Trump elected.
The Democrats continue to yammer on about gun control despite a HUGE portion of the population being against gun control (yep, I said it - the polls the liberals like to say showing the opposite are BS, plain and simple, and it wouldn't be at all surprising to find out a majority are actually NOT on their side). Most people think guns cost the Democrats control of Congress after the AWB was passed and most gun owners very likely went for Trump, and not because they legitimately thought he was a good candidate, I bet many in fact did not think that, but because they knew how bad Clinton would be for gun rights, and that matters a great deal to them. Gun owners are a highly mobilized voting block, possibly larger and more reliable than any other block, and a bigger one than the left seems to think, and so it could very well be that guns played a large part in this result.
I'd say that's a meaningful change at least, though whether it's for the better is debatable.