Anderson AOR 5.56 NATO/.223 Remington M4 Flat Top Complete Upper Receiver, 16″ Barrel

Starting a classic M4 build? Look no further than our Anderson® AOR M4 Flat Top. Anderson makes almost all components in-house, so they can control quality like few others while still delivering exceptional value. That’s probably why it’s our best-selling Barreled Upper.

• Chambered for 5.56 NATO, but will also handle .223 Remington without issue
• 16″ M4-profilel barrel with phosphate matte finish
• 1:8″ barrel twist
• 7075-T6 forged upper receiver (optics ready)
• A2 carbine-length handguard
• A2 flash hider
• Standard charging handle
• Standard mil-spec bolt carrier group

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Key Specifications

• Item Number: 608588
• Caliber: 5.56 NATO/.223 Remington
• Barrel length: 16″
• Barrel contour: M4
• Barrel twist: 1:8″
• Upper receiver: Forged 7075-T6
• Handguard: Carbine-length
• Overall weight: 4.25 lbs.
• Mfg. Number: 74603-UP