Colt 6920 Upper Receiver 5.56 NATO/.223 Rem 16" M4 Barrel, Folding Rear Sight, 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
Flat top upper receiver
Folding MaTech rear sight
Matte black finish
Bayonet lug
A2 flash hider
Complete with Bolt carrier group and charging handle