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

The 6mm ARC utilizes efficient, high-BC bullets to deliver unprecedented performance from the AR-15 platform, and is also used by specialized military groups for their multipurpose combat rifles. The 6mm ARC uses 6.5 Grendel BCGs and magazines.

Specifications:

• Barrel: 18 inch 6MM ARC SPR QPQ 416R Premium Black Series Barrel by Ballistic Advantage with 1x7 Twist, M4 Feed Ramps, and 5/8x24 Threads. All Ballistic Advantage barrels are guaranteed to give sub-MOA accuracy with match-grade ammunition.
• 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.