A cannon? No problem. As long as the requisite legalities are taken care of, no issues whatsoever.
The examples you list are examples of people breaking existing laws. There's no constitutional right to do any of the things listed. However, there is a constitutional right to keep and bear arms, upheld by the SCOTUS as an individual right. There are already limits on that right that have been enacted in law and adjudicated as appropriate limits. There is no need for further limits, despite the fearmongering by the media. Had psychiatric conditions been a limiting reason to restrict access to firearms, most of the recent events wouldn't have occurred, however, the right to patient privacy is evidently more important than a truly effective NICS system.
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