The ATF considers even 1 M16 Part in an AR to be an M16. Until the whole issue plays out in SCOTUS are stuck with the ATF ruling.
GreyGhost, Florida is part of the 10th Anti-Gun Circuit, so your only hope if caught would be SCOTUS. Now, if you were to try this in the 5th Circuit you might get a good ruling.
There was a case which I haven't heard anything else about where it was argued that since having M16 parts is considered a MG, that a DIAS (Auto Sear) cannot be a conversion parts, since you cannot convert an M16 to an M16. Prior to recently, the ATF allowed M16 parts which was the basis for the 1981 DIAS ruling. I.E. A DIAS would conver a Colt SP1 (which were made with M16 parts) to an M16.
But, should someone ever get arrested for having M16 parts in their AR, as long as they didn't know the parts were M16 parts, they should be protected by the SCOTUS ruling in I believe Staples that a person must know that something is a MG Part in order to be convicted.
BTW, don't go out and order m16 parts, thinking you won't get in trouble. The ATF/FBI has a nasty habit of BBQing people who do this.