Sure, there was the attempted assassination of Reagan and the fears for Obama as the first black President, but in those cases it was a lone nutter rather than a conspiracy.
How long can Trump crash the market before an angry billionaire decides to take him out? The remaining Koch brother is already pouring money into legal challenges against Trump…
Broadly yes, and also including private sales. I will however point out that you can buy a long gun (rifle or shotgun) from an FFL dealer in a state other than your state of residence provided the item you purchase is legal in your home state. Handguns in this situation must be transferred to an FFL in your home state, however. The former you can take with you, the latter you can’t.