18" 6mm ARC AR-15 Complete Upper

The 6mm ARC (Advanced Rifle Cartridge) was developed by Hornady and introduced in 2020 to get more long-range performance out of the AR-15 platform. It shoots long, high ballistic coefficient bullets, so it has a flat trajectory with low recoil. Those bullets hold their energy and resist wind drift well at long range, where .223 starts to fall off. That makes it a strong choice for hunting deer-size game and for precision shooting, all from an AR-15 size rifle.