New gun owners do not equal Trump voters
I guess you mean to say they're not
all Trump voters, as it stands to reason a whole lot of them will be. But I guess, when people talk about gun ownership turning people into conservatives, some take that to mean that everyone buying a gun will line up to vote for Trump in the 2020 election.
In fact, the gun-ownership-as-gateway-drug talk might mean something more akin to what MechAg was saying. It may very well cause lefties and moderates to modify their views on gun control, and this might eventually lead them to vote for more right-leaning candidates, further down the road.