Not bad at all -- although I'm not sure I can see the Desert Rangers having access to European small arms. Image in my head is that they'd have a motley assortment of heavy-hitting semiautomatic small arms from M1 Garands to AR-10s to blacked-out lever-action rifles like the Marlin 1894 Tactical and Henry Big Boy X with reflex sights or ACOGs.
Full-auto, though... just don't see it. These guys wouldn't exactly be swimming in ammunition, so they'd make every single shot count -- every shot a killshot, if at all possible. Their weaponry would reflect that tactical doctrine.