I think I posted this somewhere, but I will a second time.
I found out, from a comment made by David Niven, who was a British officer in WWII for a forward recon group, that unlike what many reporters etc describe of bullet whizz, it never whines, whizzes or buzzes, it goes CRACK. So I think that's really the only thing there.
Alot of guns are underpowered. Try firing most in single shot especially the mgs and you would realize how odd they sound. But frankly, these are not high priority. It is decent and functional for the most part, and in time, I know they would be made louder.
But what in essence we asking for is, 'Can these guns be louder?'. Its a bit of a preference, rather than a fix.
So I will say... ya, definitely low priority.