>>64155639
>5.56 FABRL but 80kpsi 30 carbine case
Add polymer case (which you did above), and now this is a list of my favorite firearms concepts. Nice.
>>64155680
8.6 Nigger supers spin at 500,000+ RPM with a larger diameter projectile and don't seem to have too many problems.
CETME used a lightweight aluminium jacket but a copper bearing surface, IIRC this increased its moment of inertia and made it more stable for a given twist rate.

>>714275706
>>714275827
>>714276063
>>714276191
The harder path, less traveled, will always resonate with those that seek fulfillment and challenge.

>>714276240
And then shit like this happens.