I purchased the B&T 4 Rail for my Benelli M4. I installed and firmly tightened the set screw as instructed. I immediately attempted to remove the set screw. The screw will not loosen. The Allen Wrench that came with the part is made of hardened steel and it actually twisted. The Allen screw is now stripped. The only way to remove screw will be to drill screw out. This is not affecting the mounting of the 4 rail as it is a perfect fit. The problem will be trying to remove rail as it will not slide over barrel with support piece attached. I emailed company. I will see what they recommend. As a side note the screw was not cross thread, it installed perfectly. Its almost as if it is welded on there. No Loctite was used. Are you able to remove set screw from your 4 rail?
