I was going to ask about this one. I thought it looked like a Colt Python in the group photo. It does resemble them.
Yeah, now that you mention it... They come close. The big give away between the 2 is the Ruger GP100 is slanted directly under the muzzle, the distance between the hammer and the grip is longer on the Ruger and the cylinder release is different. If I remember correctly, I believe the Colt Python has ports on top of it's barrel but I could be wrong.