This site has a short description on the use of the Giles sling (tactical sling);
http://www.lagger-pro.com/gilesTG.htm
This site has the HK sling;
http://www.geocities.com/metradio_uk...rs/r3sling.htm
Hopefully these urls will show, or go to google and try ("tactical sling" use) without the parentheses.