This 2012 figure is part of Mattel’s DC Universe Signature Collection. Though to scale with Mattel’s DC Classics line, it was not released on the mass-market — the company had decided the figures weren’t profitable enough to release in stores. Instead, the Signature Collection figures were sold online in limited quantities, and there were no more available once they’d sold out. Fortunately a lot of small shop owners/dealers bought them as well, so they’re sometimes available at comic shops and from toy dealers. That’s the only way you’re going to find one of these if you haven’t gotten it already (I saw one for sale at a convention a few months ago, so they’re definitely still out there).
McCulloch here is sold in a box with some nice artwork, and is a great 6.5-inch figure. He’s very poseable, and Mattel even re-tooled him slightly in response to fan input about his accuracy. His two guns can fit in his hands or the holsters, and their removable muzzles allow you to customize the way they look. If you can find him, I think he’s worth purchasing.