Colt 6940 Upper Receiver 5.56 NATO/.223 Rem 16" M4 Barrel, Railed Handguard, Folding Sights, Black

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Specifications and Features:
5.56x45 NATO chamber (accepts .223 Remington)
16.1" chrome-lined barrel
6 grooves, 1-7 RH twist
Direct gas system
Locking bolt
One piece monolithic upper receiver with MIL-SPEC M1913 rail
Full float barrel
Flip-up adjustable front sight
Folding MaTech rear sight
Matte black finish
Bayonet lug and flash hider
Complete with bolt carrier group and charging handle