In this day and time can a guard use actual force instead of just calling out someone who is trying to actually deface the tomb? Because at the time of inspection in front of the gallery you see that his or her weapon 8s not loaded.

I am sure they are allowed to detain anyone with the intention to deface the tomb or use force toward the guards in anyway. The rifle is not loaded from what I've researched. They also carry a side arm. If it's not loaded I am sure ammunition is not to far from reach in case a situation occurs that calls for such force to be used. (Self defense) They are "guarding" the tomb. It wouldn't make sense to me if they didn't have the means to do so in a serious situation.

I'm sure they will use what ever force is legally necessary to stop or diffuse the situation. The rifle its self even unloaded is quite effective. And there are monitored security cameras.

They will strictly ask you to leave and stay behind the chain fence

No they can not

Well they are not going to shoot you but I figure if necessary they can and will use the necessary physical force to defuse a problem I hope that awnsers your question