The ATI Milsport Complete Upper .300 BLK 16" Barrel 15" M-LOK Handguard & Polymer Flip-Up Sights delivers a ready-to-run upper assembly built around American Tactical’s proven Mil-Sport platform. Featuring a 16-inch black nitride barrel and a 15-inch free-floating M-LOK handguard, this upper is designed to offer smooth handling, reliable function, and easy accessory mounting for your AR-15 build.

This complete upper comes assembled with a low profile gas block, flash hider, charging handle, and full bolt carrier group, so you can pin it to any Mil-Spec AR-15 lower and head straight to the range. Chambered in .300 AAC Blackout, it is well suited for range practice, training, and general-purpose shooting with modern accessories. American Tactical’s Mil-Sport line is known for dependable performance and solid value in AR-pattern components.

Key Features:

• Manufacturer: American Tactical
• Model: Mil Sport Upper ATI15MS300ML15
• Caliber: .300 AAC Blackout
• Barrel Length: 16"
• Handguard: 15" M-LOK free-floating rail
• Included Components: Bolt carrier group, charging handle, low profile gas block, flash hider, flip up sights
• Receiver Size: AR-15
• Color: Black