>>64287476
Actually, I completely misinterpreted your previous post about cased telescoped ammunition.
Yes, I would 100% believe that they were able to achieve efficient obturation, there are many different plastics and other synthetic materials which would have the right strength and ductility to do basically the same thing as brass. Aside from decades of plastics being used for shotgun shells commercially, I have seen some cool 3D printed casings which provided good obturation.
I do however stand by the statement that claims in a patent do not have to mean anything in real life, you can genuinely just go and patent completely batshit nonsense. Pic related.