it's a double stack frame (HC = High Capacity). I have a few skills, plus I like to tinker with my hands, so I'm not afraid to fix things myself. If you do get one let me know, and I can let you know what you need to do to the mags.
I'll take some more pics, once I can find my spot light (It's around here somewhere)
BTW: before the Tan, I was shooting an XD40 in production, and even at the firwst match, I saw a signifignat level of improvement in my scores. the F.O make a hugh improvment , and the lighter trigger, stopped me from pulling the rounds to the left. The mag reloads are a lot faster too.