Quoted: So are all "assault weapons" manufactured before Sep 13 1994 grandfathered in? I have done alot of searches and i cant really find and specifics other than the date that the bill was made into law. I guess my question was not clear enough. Are all weapons manufactured BEFORE Sept 13 1994 considered to be PRE BAN according to the current AWB. Or is everything manufactured in 1994 considered post ban?

NO.

The grandfathering exemption only grandfathered COMPLETE semi-autos that were in "Assault Weapon" configuration (or were at least complete kits that could be built into AW configuration) on 9/13/94.

This means that AR lowers without uppers (regardless of other features) don't qualify.  Complete semi-autos that weren't in AW configuration (such as standard Mini-14s) don't qualify.  Etc.

Further, it is up to the OWNER to be able to PROVE that the rifle qualified to be grandfathered.  This is the case because the law states the DEFAULT STATUS of ALL AWs as "banned."  "Prebans" are an EXEMPTION that must be qualified for, and the owner must have some evidence of qualification.  That's one big reason that factory-assembled rifles bring in a lot more money than home-builds (and many of the latter are technically illegal to be in AW configuration, due to the lack of any proof).  

NOTE: if you were the owner on 9/13/94, then YOU don't need proof, as you are legally qualified to give testimony about the rifle's configuration.  If you purchased it since then, you need proof, because "the guy TOLD me it was preban" is heresay, and not admissible in court.

Now, this stuff will all go away in two weeks on the federal level, and it will be as if the law never existed.  You'll need to figure out how your state laws affect you.

-Troy