Remington Rand Type I - Correct Grips, Mag, Barrel?

[simasuma]

Hi, I'm a newbie that just recently inherited my father's Type I Remington Rand. If I'm correct, the 950418 sn puts it at the late period of type I production. I am questioning the ringed grips, the Colt mag, and the High Standard barrel that it has. Was it just the earlier models that had the Colt barrel and ringless grips? Regardless of its correctness, I am very proud to be the new owner of this beautiful piece of history.