Yes, lower 1/3 co-witness!
I ordered hand guard forend for my M4 and am pleased with it. Stock aluminum of my M4 T Pro is 323gr. Stock polymer forend on M4 is 144gr. Toni system polymer forend with aluminum mlok inserts is 92gr. And very comfy one. It’s what Toni System do, they mainly do parts for competition shooters which is why they design them as light as they can. That’s probably why people say plastic feels cheap and hollow. Same goes for their stocks for M4, design aside it’s lighter than stock.