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I've put these on the lower swivel mount of my mil-comp rifles & T they all have the multi adjustable leather replica "T" slings a friend made up and sold at the club.
Once you unhook the bottom...

When using the sling system on my No.4 T always 1/2 a turn to the left (Anticlockwise) then put your arm through the loop tighten it down then fold the sling as above behind your wrist.
The half...