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BHA Precision AR-15 18" 6mm ARC Upper Receiver– 15" M-LOK Handguard, Black Nitride Barrel, Hitman Muzzle Device
Push your AR-15 to new ballistic boundaries with the BHA Precision 18" 6mm ARC Upper Receiver. Designed for serious shooters and long-range performance in a compact platform, this upper is built around a precision 18" 1:7.55 twist barrel chambered in the potent 6mm ARC cartridge and finished in durable Black Nitride for longevity and corrosion resistance.
Featuring a pistol-length adjustable gas system for optimal cycling, this upper is ideal for suppressed and unsuppressed setups alike. The lightweight 15" M-LOK handguard offers ample space for accessories without adding unnecessary bulk, while the 5/8x24 threaded muzzle comes topped with our aggressive 30 Cal Hitman muzzle device to tame recoil and flash.
Finished off with a black anodized upper receiver, forward assist, and dust cover, this complete upper delivers the rugged reliability and precision performance you've come to expect from BHA Precision.
Specs:
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Caliber: 6mm ARC
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Barrel Length: 18"
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Twist Rate: 1:7.55
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Barrel Finish: Black Nitride
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Gas System: Pistol-Length, Adjustable
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Handguard: 15" Free-Float M-LOK
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Muzzle Thread: 5/8x24
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Muzzle Device: 30 Cal Hitman Brake
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Upper Receiver: Black Anodized with Forward Assist & Dust Cover
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Platform: AR-15 Compatible
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BCG & Charging Handle NOT INCLUDED IN THIS VARIANT
Now available at BattleHawk Armory – precision meets purpose in every shot.
| Manufacturer | BHA Precision |
| Model | 6mm ARC 18" Upper |
| UPC | 810180580731 |
| SKU | BHAU6ARC.18 |
| Width | 4.0000 |
| Length | 12.0000 |
| Height | 4.0000 |
| Weight | 5.0000 |



FFL Required