How well does the ar perform when wet? Can they be submerged in water and still properly function. I've seen footage of Navy Seals under water with thier weaopons.....wondering if the ar would function the same.

just make sure there is no water in the barrel and chamber

I can't see how it could safely be shot after being totally submerged. Perhaps if a round is chambered in the barrel and the barrel built up an air pocket like when you stick a glass in water upside down so water can't get in. Is there a guinea pig in the audience?

I have done live fires coming out of the water right off of  combatant dives and never seen a weapon malfunction...or blow up.

We do ensure the water pours out completely though as soon as we surface before we fire.  
the only difference is a lot of water blowback out the ejection port and from the charging handle area due to some water still being in the gas tube....so the gas blow back pushes it right out.

Now fireing a weapon totally submerged, or without draining.... well then I think it would almost certainly bust something due to the water not being able to escape anywhere.  

Quoted: I can't see how it could safely be shot after being totally submerged. Perhaps if a round is chambered in the barrel and the barrel built up an air pocket like when you stick a glass in water upside down so water can't get in. Is there a guinea pig in the audience?

You aren't familiar with 47 are you?

as long as you stay away from bump firing underwateryou will be ok