These will fit properly on a standard in spec Mil-Spec buffer tube.
Mine fits very well and i want to add that if you have a ar setup for just iron sights as a grab and go rifle this is a very nice stock. Balances well and feels great, mine is on a ruger ar556 w/free float tube and magpul mbus pro sights and I absolutely love the setup.
snug, but slightly,barely, if you can even consider it as slop/play horizontally, vertical NONE of that makes sense.like if held from the hook part of butt like the grip and rotated wrists , it barely moves but that's nitpicking lol haven't found any better fit so far
It fits really good on my Kaw Mil spec buffer... also on another that I don't know the brand.... tight, no slop at all! way better fit than a Magpul stock I bought. I'm very happy with it!