The only thing we still lack on those is the Control Knob. They're at engraving now and should be done very soon. Ballpark ETA is mid next week based on the last update from the engraver. We do have backorders enabled now that we're close on those. Thanks for your patience.
.....eta....
Excellent choice of components on your build. We shipped a 12.5" RS7543-equipped upper out today that is one of the best shooting configurations that's come out of the shop. This one had a Criterion barrel and NiB BCG with a Mk8 10.5" rail, Airborne Chargine Handle, & Surefire brake. With a standard spring and H buffer the thing was as close to motionless when fired suppressed as is possible. If every AR shooter could experience it....