I built a Colt Commando 733 clone a few years ago, if that counts. Its an 11.5" carbine with the C7 upper and no moderator.
I SBRed a Nodak Spud A2 gray lower and the upper is a Colt, but I may replace it because it's a large pin upper and my lower is not. It currently has an offset bushing in the front takedown hole of the upper.
I used a spikes 11.5" light weight barrel assembly and colt skinny handguards. I can't remember where I got the car stock, but it is a reproduction. Oh, and the tube is a two position, also NDS.
This is the only picture I have handy. The other rifle is an AKS74U clone, from an 86 Tula kit.
https://i.postimg.cc/qMVBYSG6/PSX-20180324-224451.jpg