I have the MI version as well as the one made by Tangodown. The MI adapter MAY allow the stock to fully close, some will, mine won't. The Tangodown adapter definitely will not, but I got it for an AR10 whose buffer tube is longer, and the stock wouldn't fully close anyway

TD


MI's adapter uses the dimple of the carbine receiver end plate to index, it anchors there to prevent itself from rotating. I've fround some of my carbine end plates are flush and do not have the indentation.
Got to have this:
