Originally Posted by Big Jim.
An 03A3 can't be missing the floorplate, since the 03A3 trigger guard and floorplate is all one piece. If the trigger guard is there and the floorplate isn't, the trigger guard is not original to the rifle. Whether that makes any difference in this case, I don't know.
It would be cool if it was one of the converted guards that takes BAR mags.
tahunua001, you can find 03A3 rear sights on evil bay pretty cheap, I think a complete sight runs 30-40+ bucks or so. From your photos it appears you only need to change out the bolt body, the cocking piece and bolt sleeve may be Rem.