If I ubderstand correctly, there is a major difference between using the 1907 sling like the US Army vs. same sling used by Britishicon Army.

In first case (US), the sling is used with arm passing betwen the small loop created between the two sling lengths ( long and short) and sling is held tight at bicep level by tightening/pulling the long end and squeezing keepers on bicep.

In the second case (Brits) the arm is simply passed in the overall loop from outside and hand is twisted into position to hold forend tight.
The sling is not squeezed in place at bicep level in any way.

Please confirm and/or add comments.


BB