Galcoâ019s Gunsite Ching Sling was originally designed by Eric S.H. Ching in cooperation with Jeff Cooper at Gunsite Academy. The Ching Sling evolved from a British carrying system that originated during the turn of the 20th century and features a three-point attachment system. Trim, light, and very fast to use, it’s a great choice for scout rifles and featherweight carbines. z The Gunsite Ching Sling requires three 1″ swivels on your rifle, one positioned just forward of the magazine. It is available in chestnut or black leather.