Looks to be an accuracy international chassis. Quite a few different actions can be mounted in one of those. Odds on would be a Remington 700 Milspec model. Could be a lot of things, hard to say with the angle and lack of visible markings etc.
That's a photo from the Sydney. Martin Place drama. If you Google you will find a lot more photos from that time.
The other images show the same two guys. It looks a bit like a Sako TRG but it's not I don't think. Similar Stock but Stainless Fluted Barrel and a Blued Action. Could be a Custom Build. It doesn't look anything like a Remington 700.
I'm not following this thread. Black rifles scare me.
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