Every single poly gun on the market uses a firing system developed in the late 1890's..................so other than the materials, what exactly is the technological advancement??
I don't consider different materials to do the same job as any real advancement, besides, poly was first used in, the what 30"s?? ( I believe Bakalite is a type of polymer, I could be wrong about that however... )
So, if you are saying that you see no difference between polymers created in the 1930s and the vast range of polymers available now (with widely varying properties), and that you see no difference in the firearms made then out of certain materials, compared to the firearms made now (with vastly different capabilities, weights, accuracy levels, tolerance levels, and reliability) then yeah, we don't really have anything to discuss.
I'll note: I personally rather think that there is a technological difference between a mechanical calculator as first created and a present-day calculator. Your viewpoint seems to see no difference as they both use the same mathematical process to achieve the same end.
I disagree.
If, on the other hand, you mean "completely different way of creating a weapon that fires projectiles over a distance" then okay, yeah, we haven't seen that in----oh, ever. After all, we've been using gas pressure to drive projectiles pretty much from the beginning of "firearms" and it wouldn't really be a firearm unless we are using combustion gases to drive projectiles.
If you don't mean that, but instead mean the action parts, then yes, there have been changes in those unless, of course, you are saying that Glocks and 1911s have similar actions? ---and if you are saying they do, then again, there really isn't anything to discuss.
I'm curious as to what you would consider a "significant difference" in firearms technology? How much difference does there have to be? You say that materials don't make the difference, action parts don't make the difference...so what exactly would?
Short of actually getting caseless ammo--(is that different enough? The gun's materials aren't different and the actions wouldn't have to be different...) ....seriously, I'm not sure what you would consider a sufficient "technological advancement."