I replaced my plastic handguards with the Midwest industries brand. Zero play or movement, Even with flashlight, and VFG or AFG I had on there. Fit is 100% perfect. I would purchase them again if I get another non railed upper that I wanted to add a quad rail.
The pic of the MI ones you posted look like standard free float rail and not the acual 2 piece drop in version your asking about.
This is what I got and am in love. I was scared they would wobble like the plastic ones, but nope..Solid
http://www.riflegear.com/p-38-midwes...r-17-gen2.aspx