Saudi forces aren't worth crap.The Turks are getting dangerous,but they'll also face all EE.They'd still enjoy superiority,at least initially.
As for the nice fellows coming in,they can cause lots of damage.That is all.We'll see
Back to .50's.You all have a rifle at home.Basically all male population,regardless of age,has an AK.An anti-material rifle is first a psychological weapon.You blow a guy from 1.5 km away,you freeze in place a platoon.Or you take out MG nests.Or whatever else you need to do.In urban combat you can cover an awsome area of environment from a dominant position. But you still only need a couple per btn. More important is training in low level infantry tactics,instinctive shooting,camouflage and movement under fire.Fact is a squad in well done ambush can take out half a company without breaking a sweat.