The ATI ATI15MS556ML7 MilSport 5.56x45mm 7.50" Black Nitride Barrel complete AR-15 upper is built around a compact 7.5 inch barrel with a durable black nitride finish. This MilSport upper pairs a forged 7075-T6 aluminum receiver with a free-float M-LOK handguard and factory-installed flash hider, giving shooters a ready-to-mount solution for their AR platform.

This upper is chambered in 5.56x45mm NATO with a 1:7 twist rate to stabilize a wide range of bullet weights, and uses a pistol-length direct impingement gas system for reliable cycling in a short package. It is well suited for range use, training, and building a compact rifle or pistol configuration where maneuverability matters. The combination of thoughtful design and solid construction reflects American Tactical Imports’ focus on practical performance and dependable craftsmanship.

Key Features:

• Manufacturer: American Tactical Imports
• Model: MilSport ATI15MS556ML7 Complete Upper
• Caliber: 5.56x45mm NATO
• Barrel Length: 7.5 in
• Barrel Twist Rate: 1:7
• Gas System Length: Pistol Length
• Handguard Type: Free-Float M-LOK
• Muzzle Device: Flash Hider
• Color: Black
• Fabric/Material: 7075-T6 Forged Aluminum
• Gun Type: Rifle
• Gun Make: AR Platform
• Gas System Type: Direct Impingement