AR57 Ultra Light Tactical Upper Assembly 5.7x28mm; 12" Barrel – 1:9 Twist Rate – Black Melonite Finish; Forged from 1 7075 T6 Monobloc Aluminum; 8620 Steel Alloy Bolt Carrier Buffer Tube & Flashider – Black Meonite Treatment Finish
AR57 Ultra Light Tactical Upper Assembly 5.7x28mm; 12" Barrel – 1:9 Twist Rate – Black Melonite Finish; Forged from 1 7075 T6 Monobloc Aluminum; 8620 Steel Alloy Bolt Carrier Buffer Tube & Flashider – Black Meonite Treatment Finish
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