18" 6MM ARC Upper - Ballistic Adv QPQ SS SPR Barrel - 15" Rail - Comp Brake

18" 6MM ARC Upper Assembly for AR15 with 18" 6MM ARC Ballistic Adv QPQ SS SPR Barrel, 15" Rail and Competition Muzzle Brake.

The 6mm ARC utilizes efficient, high-BC bullets to deliver unprecedented performance from the AR-15 platform. Because the versatile 6mm ARC does much of what larger cartridges can and everything that smaller cartridges can’t, it has been tested, selected and fielded by a specialized group within the U.S. DoD for their multipurpose combat rifle program.

Specifications:

• Barrel: 18 inch 6MM ARC 416R QPQ SS SPR Barrel by Ballistic Advantage with 1x7 Twist, M4 Feed Ramps, and 5/8x24 Threads. This is a highly accurate, precision machined, match grade barrel.
• Upper: Mil-Spec Upper Receiver machined from 7075 T6 aluminum forging with forward assist and dust cover installed. Hard coat anodized MIL-STD 8625 Type 3 Class 2.
• Rail: 15" Narrow Profile Free Float Rail machined from 6061 T6 aluminum. Comfortable and light weight, with M-LOK or KEYMOD attachment points along the entire length at 3, 6, and 9 positions. Hard coat anodized MIL-STD 8625 Type 3 Class 2.
• Gas System: Rifle Length Gas System with 0.750" Low Profile Gas Block.
• Muzzle Device: Competition Muzzle Brake with crush washer.