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    • 6mm ARC Upper Assemblies  DISTANCE + ENERGY

    The 6mm ARC (Advanced Rifle Cartridge) is a purpose-built, high-performance cartridge designed to bring true "long-range" capability to the lightweight AR-15 platform. Developed by Hornady and adopted by specialized military units, the 6mm ARC offers a flatter trajectory and significantly less wind drift than the .308 Winchester, all while fitting into a standard AR-15 lower receiver. By choosing one of our 6mm ARC uppers, you gain a factory-tested system optimized for the high-BC (Ballistic Coefficient) projectiles that have made this caliber a favorite among precision shooters and hunters alike.

    AR15Elite.com builds each 6mm ARC complete upper receiver to order, with thoughtful available options focusing on the needs of varmint hunters and precision shooters. Every upper is assembled in-house, checked for proper headspaced with Manson Go and No-Go gauges and tested for fitment plus function to ensure reliable operation. To match your preferences, each upper can be custom configured with your choice of barrel length, handguard and receiver finish, muzzle device, and adjustable gas block along with several options for bolt carrier group and charging handle.

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    Why Upgrade to a 6mm ARC Upper? Advanced Ballistics for Hunting & Competition

    Next-Gen Precision: 6mm ARC Complete Uppers

    Elevate your long-range potential with our selection of high-performance 6mm ARC complete uppers. Purpose-built by Hornady to bring the ballistics of a large-frame rifle to the versatile AR-15 platform, the 6mm Advanced Rifle Cartridge offers a flatter trajectory and significantly less wind drift than the traditional .308 Winchester. These complete upper receivers are a true "plug-and-play" solution for shooters demanding sub-MOA precision and 1,000-yard effective range without the weight and recoil of an AR-10. Whether you are competing in a PRS gas-gun match or hunting medium game, our 6mm ARC upper assemblies deliver the perfect balance of terminal energy and match-grade accuracy.

    Optimized Precision

    Every 6mm ARC complete upper we sell is optimized for reliable cycling and maximum velocity. Our rifle length gas systems allow for longer dwell time in the barrel ensuring maximum powder burn and maximum bullet velocities. To ensure long-term durability, our uppers utilize the specialized 6.5 Grendel Type II bolt face and high-pressure bolt carrier groups (BCG) designed specifically for this high-performance cartridge. We feature match-grade barrels with an optimized 1:7.5 or 1:7 twist rate, perfectly tuned to stabilize high-BC projectiles like the 108gr ELD-M and 103gr ELD-X. Arriving fully assembled with an M-LOK free-float rail and a tuned gas system, our 6mm ARC uppers are tested for headspace with Manson Go and No-Go gauges and ready to help you dominate the range or the field.

    Trust us with you build

    AR15Elite.com builds each 6mm ARC complete upper receiver to order, with thoughtful available options focusing on the needs of hunters, precision and long-distance shooters. Every upper is assembled in-house, checked for proper headspaced with Manson Go and No-Go gauges and tested for fitment plus function to ensure reliable operation. To match your preferences, each upper can be custom configured with your choice of barrel length, handguard and receiver finish, muzzle device, and adjustable gas block along with several options for bolt carrier group and charging handle.