I missed where it said 80k psi. It looks to me like an very expensive piston version of the M4. Firing the same round, I am not sure what the gain is from the military POV.
“Firing the same round, I am not sure what the gain is from the military POV.”
Tried and true be damned. Gotta sock it to the taxpayers and pay off the cronies.
The SAAMI-recognized civilian version of the 6.8x51 is the 277 Sig Fury.
It sports a three-piece case consisting of a brass body, a steel case head, and a locking ring to attach the two together.
With a steel case head, you'll reduce case head failure from such a high pressure round, and minimize extractors ripping rims off of the cases.
It’s the XM5
https://en.wikipedia.org/wiki/XM5
It fires 6.8×51mm ammo, 9 gram bullet at 2,694 ft⋅lbf ,
https://en.wikipedia.org/wiki/.277_Fury
the Army’s current 5.56 is 4 grams at 1,325 ft⋅lbf, so the new rifle shoots a bullet twice as heavy, with twice the muzzle energy, so it can punch through modern body armor
Body armor.
Big Army is re-tooling in anticipation of an era when everybody on the battlefield will be wearing body armor. The poodle-shooter 5.56's projectiles are too low in mass to meet the requirements for defeating body armor. Which is precisely why Sig felt the need to think outside the box and redefine what "high pressure" is.
This round from a 16" barrel produces near as makes no difference identical muzzle energy to a 175-grain 7.62x51 NATO round from a 24" barrel.
And with armor-piercing projectiles, it will defeat all known body armors as well as any known to be in development.