All three of those are M48BO rifles. BO means "without (manufacturer) markings". The Syrian has a Syrian crest, the Iraqi has either an Iraqi crest or jeem, and the Egyptian has no crest - but it does have a unique blued bolt, blued rear sight face, blued buttplate, and a marking disk cutout on the stock. There are also plenty of M48BO rifles around which have no indication as to what country or group they might have been sold; most probably stayed in Yugoslavia.
See the sticky Mausers, Only Mausers post 106 on page 6, post 158 on page 8, posts 636 & 637 on page 32, and post 638 on page 32. The index is in post 1 on page 1.