RGuns AR-15 Complete Upper Receiver .223/5.56 NATO 16" 1:9" Twist M4 Profile Barrel Flat Top Carbine Length Standard Handguards A2 Front Sight W/ BCG and Chargine Handle Black 7-M4CU

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Specifications and Features:
Caliber: 5.56 NATO
16" Chrome Moly M4 Profile Barrel
M4 Feed Ramps
National Match Grade 1:9" Rifling
7075T6 Aluminum Receiver with Picatinny Flat Top
A2 Birdcage Flash Hider
Mil-Spec Type III Hard Coat Anodized Black
Plastic M4 Handguards
Complete with Charging Handle and Bolt Carrier Group