The Ranger was made for Eatons. Before it was called the Ranger, it was the Eatonia. It was the model 75 that had the "whale belly" type stock which could be had in either the Cooey branded gun or any of the trade store branded guns. The model 39 type gun was the regular stock. I don't have a Ranger branded model 39 but I do have a Ranger branded model 75. The barrel on it is 24". On my regular model 75 , it is 27". So in this case a shorter barrel was produced. The Cooey model 39 barrel should be 22" but I don't know if a shorter version could be had in the ranger version. Would need someone who has one to measure it.
As far as photos showing the various Cooeys, you need to get John Belton's Cooey Book. There were a lot of different models over the years.