Good quality rail but.... - Angstadt Arms Handguard, 13.5 in, M-LOK

The rail itself is really good quality. Its super light, sturdy, and looks great. However the rail is secured by a clamp that uses only 2 small bolts and everytime I shoot my AR, the rail walks forward and I constantly have to loosen the bolts to slide the rail back into place and tighten them back. Ive tried tightening the bolts as much as I can, and I even pull the rail toward me as I shoot and the problem persists. Im not sure if maybe mine is defective, or if this is a design flaw. For a $200 rail you would expect it to stay in place. I am very disappointed.