Has both NAD(+) glycohydrolase and ADP-ribosyltransferase activity. L-arginyl-[protein] + NAD(+) = H(+) + N(omega)-(ADP-D-ribosyl)-L-arginyl-[protein] + nicotinamide H2O + NAD(+) = ADP-D-ribose + H(+) + nicotinamide Expressed in spleen, intestine and thymus. Belongs to the Arg-specific ADP-ribosyltransferase family.