Ok, I believe we are in the middle of arguing OP's point about how the pro-gun people are wrong when using the argument "only the criminals will own them", and how the pro-encryption people are right when using the same argument about encryption.

And, I think what you're adding here is that I've got an error in my statement that both parties will happily build their own firearms/encryption because the physical gun is harder to distribute than a copy of software.

And I agree in principle with this, until I realize that broad distribution of an encryption mechanism is exactly what a bad-acting government would want... crack once and everyone is compromised.

So, no, I think I would argue that its easier to distribute weapons than good, bespoke encryption.

And further, I would argue that if it is true for encryption, it is also true for firearms... that if they are outlawed, the power shifts to criminals as they will still use them.