How does that even process?
Sure, if your neighbor is firing off rounds in the street, that's an encroachment, but your neighbor simply owning a thing you morally disagree with in no way affects you. If your neighbor keeps an AR-15 in a locked cabinet and takes it down to the range for weekend target shooting, how would you even know?
Edit: I really should have taken note of your spelling of "neighbour". This post was written under the assumption that both of you have a constitutionally protected right to bear arms.
I disagree with my neighbour being able to keep anthrax-infected sheep on her property too, no matter that she tells me she's got a super safe pen for them, and really prefers the taste.
Although admittedly I wouldn't know until she gets raided by the CDC or accidentally the whole nearby biosphere.
But not because the wind carried it out... it was a malicious act of a person. There's also the ability to make bombs, and other devices. Killing has been illegal as long as laws have existed, it still happens.
Edit: I really should have taken note of your spelling of "neighbour". This post was written under the assumption that both of you have a constitutionally protected right to bear arms.