I have exactly what you are looking for! It is a DPMS upper w/ 16" bbl and A2 birdcage, but the barrel is thin profile and 1:9 twist. And it has "old school" A1 sights. It's on their website as the "Lite 16." I've only fired about 100 rds through it. Interestingly, while benching Lake City M855 and M193 ammo they both shot to same point of aim. I wish to sell am looking for a flat top.