Iceman

Hello everyone, I am new on here and saw your discussion about the plastic top rail mount on the gsg 522 sd. I just bought one also. I bought it because it was a sweet deal at 299.00, but I didn't notice till it was to late that the upper reciever on the sd is plastic like the lower. Just thought I would add this to the thread because I think this could also cause shifting issues in zero with the claw mounts as well. I think raiders is right in going with the full length rail, at least you will be tightening down metal to metal on the gas system. Just put a red dot on my cheap plastic mount I will see how it goes I guess.