Well , how do the manufactures of shot guns get away with it , [ using aluminum receivers and steel barrels ] ?
My daughters pump action win. 12 gauge has an aluminum receiver , the rest is steel.
Yes I know that galvanic corrosion does take place , but here is the explanation;
Galvanic corrosion is an
electrochemical process in which one
metal corrodes preferentially to another when both metals are in electrical contact and immersed in an
electrolyte. This same galvanic reaction is exploited in
primary batteries to generate an electrical voltage.