6mm ARC Uppers – Complete AR-15 Upper Assemblies

6mm ARC Uppers – Complete AR-15 Upper Assemblies

Shop 6mm ARC uppers for AR-15 platforms, available in multiple barrel lengths and configurations. Designed around the 6mm Advanced Rifle Cartridge, these uppers bring high-BC 6mm projectile capability to the AR-15 platform for hunting, target shooting and longer-range applications. Explore complete 6mm ARC upper assemblies for your next setup and pair with the appropriate bolt, magazines and AR-15 lower receiver.

What bolt does a 6mm ARC upper use?

6mm ARC typically uses a 6.5 Grendel Type II-pattern bolt with the appropriate bolt-face dimensions. Always match the bolt to the barrel and manufacturer specifications to ensure proper compatibility.