You ask him what bullet he used? He may have used a .308" bullet in a .323" barrel. Not all on-line sellers know what they have. S'one of the hazards of on-line buying.
Any inspection period? Mind you, Egyptian stuff is well known for being rough due to in service handling. Most Egyptian troopies really didn't want to be there.
The Sudanese AR-10's that came through the shop still had tiny parts of the desert in 'em.