You mean at the dawn of the industrial revolution, before which, you know, everything was craft built?
The Second Amendment does very much depend on the existence that industry, because if the government were to allow small arms manufacturing to fail, it would be de facto abridging the people's right to keep and bear arms. It's the only industry that has to exist in the US, by fiat.
I think this kind of monolithic homogenous group is fiction. I hear the same thing from other people about tech. Both sentiments lack a nuanced perspective.
The amount of guns purchased by "gun nuts" reminds me of the stats on alcohol consumption: something like 80% of alcohol is consumed by alcoholics.
So you can mobilize a very rabid base politically.
Also, the gun manufacturers are tied in with the military and the diplomatic powers that be of the US (aka THE power brokers of the US government and the world).
Not when a Constitutional Amendment makes that industry "too big to fail" because its thesis on the necessity of the right to keep and bear arms depends on there being an industry manufacturing arms to begin with (at least at modern scale,) and when the industry overwhelmingly supports one political party, driving animosity with fear-based rhetoric against the other.
You just don't have the same intersection of identity politics, culture and even religion with any other industry in the US that you do with guns, even if the money spent elsewhere is greater.