Need some gun knowledge and some system creativeness here. Recently a player character took the better part of valour and hopped into a stream, leaving the bewildered doctor to trade blows with an angry boar in close combat. He got fully immersed, found his footing, brought up his carbine and popped off a few at the piggy.

What does that do? I can't imagine it being good for the gun, AK or no (it's a 74SU I think). Maybe the getting wet would count as a period of use, and the immediate use thereafter without giving it some maintenance gives it a point of wear? (still new to the game and not sure off the top of my head the system for all that, but you get the picture)

AK's don't care about mud or water, unless, of course, he got mud in the barrel. He may have to spend a little extra time on maintenance.... maybe.... AK's are some of the toughest weapons I've ever seen.

I'm hardly an expert but I know it's not good for it. I think the only real problem would be water/mud in the barrel like tonyngc mentioned, but presumably he would have given a little shake to clear the water before firing. Otherwise you tend to damage the barrel or cause your weapon to catastrophically fail.

I don't think getting a gun wet is a problem, so I wouldn't worry about extra wear for example. However, shooting it wet would be a different story and I think simply for the narrative what you've proposed makes sense.

Yet they still wear out and start malfunctioning. And they most certainly care is the safety is off and you get sand/mud in the FCG group. There's a youtube video floating around that shows an extreme case of this where an AK with the safety off handle being covered in sand much worse than an AR-15.

I'd say what to OP suggests is appropriate.

The main concern of water is pressure buildup. As far as the internals, getting them wet isn't "good for them" but as long as they get drained before firing, and reasonably dried at some point, it shouldn't be an issue.

There are ladies of the night in Thailand who would be a snugger fit than the internals of an AK.

From experiance and from what I've seen and heard/read about. most piston operating systems don't care about water as long as the barrel is not filled with water or debris, the direct impingment systems are much more sensitive and can rupture if there is water in the gas tube even if the barrel is free of water or obstructions.

If there is much water in the barrel when that thing goes off, you run the serious risk of having too much pressure in the barrel (bullet + water) and having a catastrophic failure (boom in your face).

The easiest way to minimize (though not completely avoid) this is to simply point the barrel down, pull the bolt back just enough to "pop" the vacuum, and let the majority of the water flow out the end of the barrel. Then, simply let the bolt slam back home and you are good to go (though any serious failure might equate to not getting the water out and the gun going boom in your face).

HK used to have a video demonstrating how versatile their guns were by doing just this. They would toss the gun in a puddle, pull it out, pop the vacuum, then rock and roll!