Who makes double heat shield plastic handguards?

[Newaza]

Who makes good quality double heat shield plastic handguards for (1) the M4 carbine and (2) the mid-length?

[OPPFOR]

Here you go: http://www.bravocompanyusa.com/M4-Handguards-Black-p/bcm%20handguards%20m4%20black.htm

Not sure about the mid-length.

[Roklok]

Here you go: http://www.bravocompanyusa.com/M4-Handguards-Black-p/bcm%20handguards%20m4%20black.htm

Not sure about the mid-length.

The customer reviews on the mid-length handguards are bad.