FWIW- Back when I was collecting #5MK1s.

I used to use web slings, original Brit. stuff, but I never did find out for what rifle they were made for.

The slings were sage green web, slimmer than the standard Enfield slings, and have brass ends.

They were perfect for the #5MK1.

Slimmer, smaller, and looked good on a #5MK1.

I'm sure someone knowledgable can chime in and tell us what rifles these smaller, thinner, slings were made for originally.

The slings were basically like the web Enfield sling, but without the large rib on the edges. I have seen them only in sage green.

I can post a picture of one of the slings, if needed.

There was only one source of these slings. It was an outfit in Oklahoma that used to have a table at our gun shows in L.V.
They had a lot of old Military items.

This was quite a few years back and I may still have a link to their web site.