Are the .40 and 9mm barrels interchangeable in these guns? In other words, if I buy the SR40c can I buy a 9mm barrel and magazine for the gun and have it work? I know you can do this with other guns such as the Shield.
I highly doubt it. The recoil springs would be very different for starters. I know the guns don't share identical dimensions.
Well, it's a scientific fact that raging about things on a board full of gun nuts is actually the most effective political mechanism for change, but NRA is a close second.