Newly assembled Aero/Rosco K9 12.5 upper if anyone is interested. Parts include: Rosco 12.5 Sage Dynamics Barrel. Aero upper. Aero Mod4 hand guard. BCM hand stop. YHM muzzle brake. Odin Works Adjustable Gas Block (That’s what the Allen keys are for) also have a brand new dirty bird BCG, breek arms ambi charging handle, 2 sba3 braces, and B5 pistol grip. Lmk if you’re interested and shoot me an offer. Also open to trades too.