I bought this rail as an inexpensive rail for occasional use with a Surefire weapon light on an A2 style AR15. The mounting holes did not quite match the cooling hole spacing in my hand guards which required enlarging two cooling holes. The hand guards were made by a GI contractor but since they are green and are less stiff that my black hand guards I suspect that they are not made to MILSPEC. Given the number of products that CAA makes I doubt the mount is incorrectly sized and that the issue was with the spacing of the cooling holes. I'll chalk the spacing issue up to the hand guards.
Once the holes were modified the mount went on fine and was adequately aligned with the rifle bore to give a sharp sight picture at 100 yards through iron sights. The mount comes with two lengths of screws for use with or without heat shields. The rail dimensions are correct for my Surefire Millenium series weaponlight.
Overall it is a well made product that seems to be more than adequately engineered from the structural strength perspective. I believe that anything that breaks this mount will break the hand guard too so an aluminum rail would cost more and be of little practical benefit.
Pros: Inexpensive, color matches my rifles stock.
Cons: See the full comments.
This review was written in the old system and had content requirements that are different than reviews written today.