I would agree that a free floated aluminum rail, with a heavy duty mount and heavy duty bipod, would certainly be more stable and heavy duty. BUT, a person with a $399 AR15 rifle is not going to add a $350 Geissele rail, A $280 Atlas bipod, and a $85 Larue bipod adapter to have the most sturdiest, best built bipod for his first National Match rifle shooting competition at Camp Perry. My advice was tailored to the apparent (assumed) budget of the op. The bipod mounts I recommended are acceptable for those on a budget and are not going to snap off or break at the range when he takes his gun to the range once/twice per year.