https://soldiersystems.net/202...rc-rifles-to-us-dod/

I'd like to know a bit more about this request.

Basically, it's the SAAMI spec'd cartridge that is a 6.5 Grendel necked down to 6mm to put it in the simplest terms.  I like that Hornady is at the helm of the release.  They know how to roll out a new cartridge.  While I'm undecided on the ARC, I've long since thought the intermediate intermediate cartridge that needs to exist between 5.56 and 308 should be 6mm.  The Grendel should have been 6mm, the ill-fated Valkyrie initially started as 6mm.  The should have kept up with the 6mm SAW...

The problem will be: 1) Bolts and 2) Mags

Grendel boys swear by the JP bolt and those guys that even venture toward moderate loadings will tell you bolts inevitably crack due to the amount of meat that has to be removed to handle the larger base diameter.  LMT used to do an enhanced 7.62x39 bolt (which I am to understand is the same as a "Grendel 2" spec) that would last longer than a half dozen Colt 7.62x39 bolts, but that has been discontinued for a while...hopefully it makes a come back. 

I can't say I really trust Grendel shooters to know if their mags are duty-grade.  I'm sure there are some that feed with decent predictability but binding is a problem.   Nobody wants to grind/mod/tweak every single mag in the hopes it will be reliable.  There needs to be an "easy-button" option like the P-Mag is to 5.56 AR mags (though polymer likely isn't going to be the answer to these fat cartridges).

Personally, I'd rather adapt to another platform that's more capable than shoehorning it into the small-frame AR.  Perhaps something like a SCAR or similar platform (Bren, 433, B&T, etc.) can handle a beefier bolt design and allow for a proprietary mag that it will probably require.  Then give it the MK20 treatment and acknowledge it for a DM/sniper option it's supposed to be.

I'm wondering about it as a future LE DM/sniper option.  We utilize a scoped 5.56 DMR/SPR/mk12ish gun quite a bit due to versatility.  We know we take the hit on ballistic performance, and 85-90% of the time, we'll make that sacrifice for other capabilities.  I'd like to see how this round fairs against barriers and auto glass.  We won't know until we know.  However, history is not with me in that hope and likely it could be yet another expensive jack-of-all, master-of-none option like its predecessors.

I hope this cartridge does well or helps spawn a similar or better solution for the middle-ground that the others could not achieve in terms of long-range performance.  But given the ride the .224 Valkyrie has taken, I think I will wait on the sidelines and watch.  If/when Berger, Lapua, Federal get into the game I might take more notice. 

Last edited by Community Member
@Community Member posted:

Someone needs to man up and write a major purchase order on a stretched AR15 with a larger bolt and magwell to take something like 6mm Hagar. 

Like an AR-10?

@Community Member posted:

No, something shorter and 30% lighter with less recoil. 

Like that CMMG "Mutant" or whatever it was called that they created for 7.62x39?  Or the POF "Revolution" scaled down AR-10?

Last edited by Community Member
@Community Member posted:

More like a DPMS G2, but smaller. .42 case head and 2.6” COAL, no wider or taller than an AR15. 

I would probably be ok with slightly wider at least in the magwell area, to better accommodate the fatter 6mm ARC cartridge stack and allow for polymer magazines.

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