The Turner leather sling is excellent, I've been using one for 20 years or so
They also make a synthetic one that is also excellent, if a little tight to adjust.
As I said, the Turner is excellent, but Ron Brown ones are better....and Les Tam slings are even better than those
In fact nothing is better than a Les Tam, but you'll have to wait up to 2 years for one
Don't consider any other leather sling than those three, coz it'll be shite
The trick with M1907 slings is learning how to use them, and I'm happy to give free lessons
As for the Kurt Thune etc, excellent, but you can't carry the rifle with them
The reason why you only see the other types here is because the M1907 types don't have enough nylon, clips and Fastex buckles....but they're really all just gimmicks