The handguard is made pretty well as far as M4 double heatshield handguards go. I purchased one because of positive things said about IMI's over at ARFCOM forums. The black inner heat shields basically pop into place with 4 tabs in the 4 corners that snap into their own slits above slits for the silver colored outer heat shields, and I imagine they will stay put.
The other brand of these I've seen, which I had seen good things said about, are Doublestar USA ones. I have to give the IMI ones a better review for how the metal heat shields are retained inside -- the black inner heat shields on the Doublestar double heatshield models are basically pushed onto plastic pin extensions from the handguard molding sticking down through both heat shields, but don't stay in place well. This is why I went looking for another brand.
Another comparison I'll make between the IMI Defense and Doublestar ones is the look/feel of the handguard itself. The (black) Doublestar ones -- at least if you get ones that aren't scratched/gouged up straight out of the bag -- are more of a uniform, matte black. One of the first ones I got ordering direct from Doublestar was apparently a demo or returned unit, it was scratched up and the scratched up places were shiny. (they replaced that one after seeing the pictures I sent them). The IMI Defense handguards, which I have black and OD ones now to speak from seeing/handling, are a more glossy type of polymer material. They're fine too, just more g...
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