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If the Textron bid is the clear favorite than I could see actual changeover happening. IMO 5.56 won't be replaced until a new technology is developed to a sufficient level that there are clear massive benefits to replacing it that outweigh the cost of replacing the M4 and 5.56. Hard to justify...

In fairness to SIG, it sounds like the 6.8 projectile idea came from the army.

I'm sure it isn't trivial, it doesn't seem like it'd orders of magnitude more difficult than the NGSW proposals are. Yes, it'd be somewhat impractical, but not more so than a new rifle already is. In the videos here the SIG people talk about their gun design and brass-steel hybrid cartridge...

It might have made more sense to just build a gun that can handle M855A1 better than the M4 can, since my understanding is that the chamber pressure with that round exceeds 5.56 specs and wears a lot more on the M4.