Whats included with this complete upper:

• KMR-A5 KeyMod™ Handguard.
  
• KMSM (KeyMod™ Sling Mount)
• One 3″ Picatinny Rail Section
• 762/300BLK Flash Hider

BCM® has taken great care to ensure the best possible performance and interchangeability. However, due to the large operational range of 300 Blackout ammunition in the market place, BCM® cannot guarantee function will all ammunition types in all conditions. These barrels were designed to run High Velocity ammo only with a H3 buffer.

Fine tuning may be required in limited instances based on ammo and buffer choices that work best for the desired application. BCM® also recommends running the Crane O-ring (provided with all BCM® Bolt Carrier Groups) over the extractor with 300 Blackout.

Specs

• Caliber: 300 Blackout
• Barrel Length: 7″
• Barrel Material: 11595E Spec Steel
• Barrel Finish: Manganese Phosphate per Mil-Spec
• Bore & Chamber: Chrome Lined
• Weight: 2.2 lbs
• Twist Rate: 1:7
• Gas System: Pistol
• Muzzle Device: 762/300BLK Flash Hider
• Muzzle Threads: 5/8×24
• Handguard: KMR-A5