Supershooter-
Thank you for the information - I was wondering about that "feature" on the outside lip of the drum myself.
I have shot the new Kahr drums in my 1928. I felt the spring was weak and I hated all of the clicking during a quarter turn.
However, I did dump it a few times in full auto without a jam. Other times I did have a bit of snag during feeding inside the drum... maybe two or three times out of ten. I am ruling out ammo because it was the same type of brand new commercial ammo in each load.
If you are interested, Numrich (
link to drums here) had or has WH era marked "LEO" drums that are not Kahr manufacture that are a bit more correct without the copper ring. I don't know if they have any more for sale, so I would suggest you call them if you are interested before placing an order.
Hope that helps-
Chris