So the numbers match on the bolt, the cover, the magazine, piston rod (none on the stock). Should I be looking anywhere else? Also where would I find the "III" on the sight is there a picture on here so I know what the heck I'm looking for? and thanks again for all the great replies, only whish I could buy you all a beer.
Stamped numbers will be on the receiver, receiver cover, bolt, bolt carrier, trigger group, magazine, and stock. Electropenciled numbers can often (but not always) be found on the gas piston, gas tube, under the rear sight leaf, extractor, buttplate, and once in a while on the firing pin.
The III RSL looks like this:
As far as I know, there is only one version of it, whereas there are multiple versions of the other flavors like these "Ds"
Agree with Boris on the uncertain definition of the P suffix. We don't even know whether it was applied by the Chinese government, the exporter, or the American importer. It does have something to do with the lot of guns though. Whether it's an means for ensuring a unique S/N or a record-keeping tactic used by the Chinese won't be known until we have much more data.