The New Colt M4 enhanced stock does not have the usual Colt 1 or N markings. They are similiar too but of better quality and manufacture than the RRA/Bushmaster Copy. Easist way to tell is by the fiberlite material used and the 90 degree angle in front of the release lever. Of the 35+ I've received, all were in White label marked Colt bags. They come from Colt as either a complete stock with buffer tube, spring and H buffer or as a replacement part(stock only) for the Older style Colt stock.
All new Colt M4A1s from the factory have the new stock in place. Colt was using up it's supply of the Older M4 stock on LE guns, but for the most part LE guns now come with the M4 enhanced stock. I'll try and find my current TM manual with the NSN# for the replacement stock.