Textron Systems NGSW Rifle and LMG

[A5BLASTER]

The bulk being the polymer telescoping cases? I have a feeling they are not going to be happy with that ammo in the long run. Despite expectations and proclamations, the polymer will deform over time. So either it is going to have a much more limited shelf life than brass cased ammo and be pulled from service or it is going to induce malfunctions.

Agreed. Something that I haven't seen anyone mention is this.

What happens in a long drawn out firefight and that chamber gets hot enough to start melting that polymer case and cause polymer build up in the chamber walls?

Seems like this case design would require more maintenance in the feild to keep from having a kaboom due too chamber build up are a jam due to polymer build up on the chamber walls.