I would'nt technically call it a frankengun since you used all CMMG parts. I would say you did your own assembly using CMMG parts. My understanding of a franken gun is assembling parts from different brands.Hmmmm.... so one of the many times I built a rifle.... I bought a CMMG lower and used only parts I could buy from CMMG, paired that with a CMMG upper, etc, etc, etc..... Now in my opinion that is still a frankenAR.... so how will you all know if it is factory or not...... the plot thickens.
You just can't truthfully make the claim that it's a factory assembled CMMG gun.