If anyone could guarantee that by banning this one specific, yet ambiguously defined, "assault type rifle" that no mass shooting would ever ever happen again, I'd support it instantly.
But we all know that it won't. So what's next? Any semiautomatic rifle whether it's black and scary or pink and flowery?
Then what? All semiauto handguns? All guns period?
Not trying to be overly dramatic or poetic but let me paraphrase something that came out of the holocaust:
First they came for the ar and I didn't stop them.
Then they came for my rifles and I didn't stop them.
Then they came for my handguns and I didn't stop them.
Then they came for me and I had nothing to stop them with.