God bless the mad lads making gun control irrelevant.
The big deal here is the upper receiver. That's is a 3D printed part, and it's the first in a rifle caliber (even if it is an intermediate cartridge). It's been test-fired once just to see if it fails at all. This iteration may well fail before hitting 500 rounds fired, but future ones will quickly reach build strength and quality equal to any AR-15 that you can buy off-the-shelf like the Smith & Wesson M&P15 or the Ruger counterpart or those entry-level AR kits you can get from Palmeto State Armory.
This is a proper bolt-action rifle; it's a straight-pull bolt, like you see a lot in old Swiss service rifles and contemporary Biathalon rifles, and that means this is now a true competitor to rifles like Mossberg's MVP Predator and Scout line that makes use of AR-15 magazines as a selling point. Once this upper receiver design takes off and reaches the strength we're getting with the polymer Glock frames now being made everywhere, you're going to see a massive explosion in the platform once more.
And that's no good for the gun grabbers. On and that stock is likely a 3D printed version of the Ares SCR design
Yes, there's work being done for other parts such as barrels (to avoid serialization), shells and cartridges (manufacturing, not reloading), and other parts that are yet still reliant on established manufacturing techniques. Projectiles have been home-made capable for centuries with hand tools, so all that's needed are materials; the trick is figuring out how to do copper jackets and other latter-day innovations. Then it's powder--smokeless, specifically--and primers.
Once this knowledge and the tools to use them are sufficiently decentralized and distributed to individual households, being like Beta Beto and grabbing the guns will become far more difficult. Thralls want their prey to be vulnerable. Distributed manufacture of weapons prevents this. Empire Must Fall.