I seen them for sale and forgot where. I know i can make one and seen the stuff too, army store and somewhere else. Its a rubber tube black or can get in od and make a sling attachment link for sling and front sight post. I saw some for sale like it, thinking i would do that instead of the sling swivel mount for barrel,since they are 30.00 at legaltransfer(which i rather have). Opinions and advice appreciated.