Michael Edwards, 72, was caught wielding the weapon on video as he rushed out of his home in a rage to confront his victim.
A court heard videographer Daine Gooden, of Swindon, Wilts., was innocently filming a neighbour's home from the sky for an estate agent listing on 22 August last year..
But he was left shocked when Edwards began shouting and swearing at him while armed with a black realistic-looking pistol.