The ATI Milsport AR-15 Complete Upper 16" Barrel With 15" M-LOK Rail is a ready-to-run upper assembly designed to drop onto any Mil-Spec AR-15 lower. Built around a 16" steel barrel with a 1:8 twist and durable black nitride finish, it includes a low-profile gas system, A2 flash hider, and a 15" free-floating M-LOK handguard for modern accessory mounting.

This complete upper is ideal for range use, training, and general-purpose AR-15 builds where reliability and simplicity matter. The included phosphate bolt carrier group and charging handle mean you can go from box to bench with minimal setup, while the long M-LOK rail offers ample space for lights, grips, and optics. Backed by American Tactical’s reputation for value-focused design, it delivers a straightforward, dependable foundation for your next rifle project.

Key Features:

• Manufacturer: ATI
• Model: Milsport AR-15 Complete Upper ATI15MS556ML15
• Caliber: 5.56x45mm NATO / .223 Remington
• Barrel Length: 16"
• Rate Of Twist: 1:8"
• Handguard: 15" Free-Float M-LOK Rail
• Bolt Carrier: Phosphate Bolt Carrier Group Included
• Threaded Barrel: 1/2x28 With A2 Flash Hider
• Includes: Complete Upper Receiver, Barrel, BCG, Charging Handle
• Color: Black