Complete 16-inch M4 upper in 5.56 NATO with a phosphate-finished barrel, carbine-length gas system, bolt carrier group, charging handle and rear MBUS sight.
- Manufacturer Part # : DP51655109558
- Type : Complete Upper
- Caliber : 5.56 NATO
- Barrel Length : 16"
- Barrel Finish : Phosphate
- Gas System : Carbine
- Rear Sight : MBUS
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