Can I make a rifle out of an AR-15 lower registered as a pistol?

[dfletcher]

Regarding the "once a rifle always a rifle" responses this is no longer true OUTSIDE CA. A stripped receiver or a built receiver with no upper attached are sold via 4473 as "other" and can be configured as a handgun, assembled as a legally configured rifled and then reassembled as a legally configured handgun. No SBR is permitted but other than that, OUTSIDE CA, one is fine. A person buying a stripped lower or lower with only a shoulder stock attached must be 21 yrs old.

Regarding the original question, the stripped AR lower can't be sold via FFL in CA as a handgun. If the seller sends it to a CA FFL is there any reason it can't be DROS'd & sold as a rifle?