Replica of a Civil War sling
This sling was found on some of the Austrian Muskets used by the South
The Remington Danish rolling blocks also used a sling of this type but
the hook was steel and pointed.  The Bulgarians also used a sling of this
configuration with steel hook, shorter and holes on the hook end.

Springfield 1903 made in 1918

M1 Garand

Kerr sling used on Thompson SMG

A variation in color

Reising SMG-looks like M1 Carbine but is shorter

M1 carbine C clip

M1 Carbine D clip Vietnam

M16 silent plastic buckles

M16 metal buckles

Seal MP5