I don't know about other houses but at mine it isn't too noticeable. I was running my generator and I went into a room which is right inside where the generator was running and I couldn't hear it all that much.
My Springfield M1A. I put a USGI walnut stock on it. A dummy full auto lockout switch and arm to fill the gaps in the stock and a USGI flash hider with bayonet lug. Also a USGI fiberglass handguard. Looks like the real deal M14. Looks pretty good with the bayonet attached.