CMMG has always constantly pushed the limits of what the AR-15 can do, and they continue with tradition with the CMMG Endeavor in 6mm ARC
CMMG Endeavor 6mm ARC Rifle – New Long Range AR-15 Cartridge ~ VIDEO
6mm
Today is Sunday, May 24, 2026 
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Starline Brass Now Offering 6mm ARC Ammunition Cases
The 6mm ARC, or Advanced Rifle Cartridge, is essentially a shortened 6.5 Grendel that has been necked down to 6mm.