Bushmaster M4 Flat Top AR15 Complete Upper Assembly – Black | 5.56NATO | 16″ Barrel | A2 Handguard | A2 Flash Hider

Specifications: – Caliber 5.56 NATO (.223 REM) -16″ Barrel with a 1:7 Twist Rate – M4 Style Handguard  – Flip-UP Rear Sight  – Salt Bath Nitride Bolt Carrier Group -MPI Tested Bolt – A2 Birdcage Flash Hider 1/2 x 28    Features:  -The gas system is carbine length – 7075 Forged A4 Flat top – F-Marked sight base for sight alignment, providing correct carbine sight alignment   Proudly Made In U.S.A. 

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