So after a longer than expected wait, I finally got my DD upper to accompany my Spikes lower that I had built a while back. I got the upper last month, had to send it back because the front pivot pin hole on the upper was out of spec, it was honed by DD, got it in the mail from UPS today. Here's my thread from the lower build http://glocktalk.com/forums/showthread.php?t=1305089 I put an Magpul grip, along with Magpul flip up sights on the upper, along with some ladder rail covers on the upper. I haven't shot it yet, I put the grip pretty far out on the rail because I want to use a "thumbs forward" grip like I do with handguns. Of course, some pics of the finished product!