Fair enough, let me rephrase . RHC has tested it on (afaik) all AR tubes. I have tested it on WE, G&G, TM, KWA, VFC, and maybe a few more; it fits all them. It also comes with a shim to convert it to fit thinner tubes (real steel called civi tubes). Plus, you can just attach it to any sling mount; I have this sling on my TM MP7, S&T TAR, ARES Stoner, and my E&L AK, none of which have buffer tubes.