I
verb
BAD : I had to spend forty-eight hours listening to him with a gun pointed to my head.
GOOD : I had to spend forty-eight hours listening to him with a gun pointed at my head.
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point at = hold a weapon, camera etc so that it is in line with someone or something: 'Never point a gun at anyone.' 'With a knife pointed at my chest, I was in no position to argue.'
Compare: 'I'd like one of those,' he said, pointing to/at a Mercedes.'
II
noun
BAD : There's no point to complain about the service.
GOOD : There's no point (in) complaining about the service.
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there is no/little point (in) doing sth (NOT to do ): 'There's no point in going on Sunday - all the shops will be shut.'