I have to confirm this for both Mosin and Magnum revolver. Kills my ears.

I concur that it's the Magnum revolver, I have a shotgun and Magnum in a Hardcore server, reloading with a speedloader or rounds always causes the VERY loud static to go off (my ears hurt, even when logging in due to the reloading sounds upon spawn).

-Windows 7 64-bit
-hardcore character, not tested in regular because that one doesn't have a revolver.

Same thing here. It happens both when entering a server and when at the main menu. Its whenever the loading action is called (ie whenever a character with a previous loaded gun is loaded onto the screen or the gun is reloaded in game.) It is a very annoying white noise sound that might be coming from a corrupted sound file or in complete sound file. I have both a Mosin and Magnum on my person but the Mosin is the one i have really noticed. Re-spraying the Mosin green changed nothing.

Happens with the revolver as well when you are closing the cylinder.

This happened for me several times when spawning in with a Mosin. The first instance of the glitch game when I first switched back from experimental and joined a regular stable DAYZSA server. The Mosin would also make the loading and action noise almost a minute or two later that would scare the living shit out of me (haha)

These issues stopped when I started carrying an SKS.

My Mosin did have an M44 compensator on it, and was loaded. I did not try unloading and removing compenstator in relogs. Unpainted.

Happens to me as well. Not sure how to reproduce but I can get a loud static when joining a server. Will also hear what I can only assume is proximity chat which is being broadcast on some 'global' channel.

This seems to only happen if I have a loaded Magnum in my inventory.