A man who says takes the guns first is not capable of saying I don't know why anyone needs an Ar-15?

Not what I said. I've never said he didn't say it, and I can't...for the exact same reasons I can't say that he did; terrible sources and biased reporting. There's nothing here saying anything either way, so it's bullshit until proven otherwise.

You could write the exact same article, but substitute the AR-15 quote for Trump saying "I love raping" or something equally offensive and outrageous. Can I prove he didn't say that? No...but I'm certainly not going to believe he did! Because the media loves to smear him, and there's no evidence of their claims.

Trump was a NY Democrat for decades. Is it so far-fetched that he would be for gun-control?

Again, completely irrelevant. You made a specific claim, but it's backed up by the exact same style of reporting that did nothing but lie about him for years. Why would I start believing this crap now?

Is it possible he said it? Of course; it's possible he said anything. Is it any more possible or believable now that the Washington Post said anonymous sources said it happened? Nope, in fact I'm less likely to believe it now.

You don't seem to be getting my argument. There's nothing saying he said this, there's a history of lies about him, and none of his past statements (including very bad ones like you've linked) make it any more or less believable. The core evidence is lacking, so any 'well he did this so' falls flat because, again, it's all just imaginary until proven otherwise.