9x39 AS VAL MAG AR-15
A recent project from Dmitry Chuchaev's Rubicon Arms out of Russia
Chuchaev is a former Molot employee, who worked on the development of what would become the RPK-16 (covered in our video on it), and now has done a bunch of his own AR and civ projects
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Only known image of the .338 XM1224 HAMR
Note the High Pressure steel case, likely either Federal PEAK or UDC M-PACT MIM case.
No word on whats inside the bullet, but I suspect its a Tungsten + Zirconium + High Explosive similar to the .50 Raufoss MK211 but modernized.
The rivers, the Charles and the Mystic they're the heart of Boston, that's how you re-establish trade going all the way from Salem to Quincy, yet they are infested with raiders and mutants, whoever clears them holds the keys to the commonwealth in their palm.