The RISE 6mm ARC AR-15 Upper Receivers features an exceptionally accurate 18-inch 416R stainless steel threaded barrel.

Features :

• Forged Billet Aluminum Receiver
• 6mm ARC
• "18" 1:7 Twist 416R Stainless Steel Barrel"
• 1/2x28 Threaded
• Rifle Length Gas System
• "15.25" Free Float M-LOK Handguard,
• RISE Ambidextrous Charging Handle
• Black Nitride Blot Carrier Group
• Black Anodized Finish