How loud are firearms in DD& 5e and can Artificers modify or  build firearms that reduces the noise it makes?

Basically how far can you hear a gunshot and the standard DC for Perception(Wisdom) to detect it?

While understand you can cast Silence on the firearm, I'd rather find was to reduce the noise by mechanical means that or give a disadvantage on Perception(Wisdom) checks to detect it.

EX: Gunshot noise can be heard up X feet away at a DC of Y
With modification or built with some noise reduction
So Modded Gunshot can now be heard up to X-Z feet at DC of Y-Z