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Dpms

Assuming you're referring to the forend/hand guard, not a vertical forward grip.

I use an Odin Works forend on my DPMS pattern AR10. It's light, free floating, flat on the bottom and well-ventilated.
https://www.odinworks.com/category_s/1907.htm

Lancer systems make a crazy light, and stiff carbon fiber one
https://lancer-systems.com/awc/product/lch7-handguard/

JP rifles has a pretty solid reputation for a great product- I've used them and like them
https://www.jprifles.com/1.4.4_hg_mkiii.php

 
Assuming you're referring to the forend/hand guard, not a vertical forward grip.

I use an Odin Works forend on my DPMS pattern AR10. It's light, free floating, flat on the bottom and well-ventilated.
https://www.odinworks.com/category_s/1907.htm

Lancer systems make a crazy light, and stiff carbon fiber one
https://lancer-systems.com/awc/product/lch7-handguard/

JP rifles has a pretty solid reputation for a great product- I've used them and like them
https://www.jprifles.com/1.4.4_hg_mkiii.php

Which model and how wide is the flat on the bottom?