Hit or miss - Fostech Bumpski Standard w/Tang Complete Assembly

This is my first bumpstock that is all made in aluminum. I own several polymer bumpstock and they all work flawlessly and the finish is decent. However, the finish is terrible on the Fostech, but the functionality is there and feels well built compared to the polymer bumpstocks. Also this bumpstock does not fit milled ak47 receivers due to the pistol grip mounting bolt milled into the receiver like my c39 tactical sporter. I ended using my Bulgarian stamped ak47 instead.