Stripped forged 7075-T6 AR-15 upper with a scalloped top and ports opened for calibers up to .450 Bushmaster.

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Next Level Armament NLX Elite 5.56x45mm NATO AR-15 Upper Receiver Stripped Forged Black
Every NLX556 upper starts as a 7075-T6 aluminum forging that Next Level Armament machines, tumbles, inspects, and hard coat anodizes to mil-spec thickness. The visual signature is a scallop cut down the top of the receiver, which trims weight and lines up with the cuts on Next Level's M-LOK handguards.
Next Level opens the ports on every upper during finishing so the same receiver can be built in anything from .223 to .450 Bushmaster, which is why it is the base of its GFK 5.56, 350 Legend, and 450 Bushmaster complete uppers. It fits standard mil-spec AR-15 lowers.

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Add the Next Level Armament NLX556 Forged AR-15 Upper Receiver to your build and see how it enhances your platform.