You can say that anyone who is single issue on guns is extremist... there are multiple threads on reddit that make it clear you are wrong.
The thread, and there have been ones similar to it for two weeks now, I linked is FULL of people who do not like Trump and are looking for a reason to vote for Harris and are close to doing so... but the gun thing is holding them back or are going to vote down ballot red while voting for Harris out of a hope that it prevents congress from being able to act.
All she had to do is focus on ref flag laws, background checks, ext and she had those voters.
Also, something that hasn't been discussed her yet... how come she isn't focusing on mental health care? Aka the real solution to gun violence in this country. Outside of the 90s- automatic weapons have always been a thing. (And by the way, the automatic weapon ban is part of what led to multiple red waves in the late 90s, early 00s). It was gutting mental health care that got us here.
I again point to Beto, who literally tanked his career, by taking this stance.