The ADC Custom Spartan series is characterized by evident technical and aesthetic details, which clearly differentiates it from the “entry level” M5 series.The Upper and Lower of the Spartan rifles, although fully Mil-Spec compatible, differ visibly from the components of the common AR platforms and are easily identifiable as the real Made in Italy for the attention paid to Design and every detail.SPECIFICATIONS:CALIBER: 223  / 300AACLENGHT: 12,5″ – 14,5″ – 16″  – 18″ (Cal.223) / 12,5″ – 14,5″  (Cal.300AAC)TWIST RATE :  1/9 (Cal.223)  –  1/8 (Cal.300AAC)UPPER: Forged and machined from our design billet – AL7075T6Hard black anodizedMIL-SPEC and M4 Feed rampsMade stronger than other similar commercial rifles                                                                                                                                                         LOWER: Forged and machined from our design billet – AL7075T6Hard black anodizedEnhanced flared/magazine  – Integral trigger guardMade stronger than other similar commercial riflesBARREL: Hammer forged nitrited – Heavy profile – thread: 1/2 X 28 or 5/8×24GAS SYSTEM: Direct gas impingement with gas block low profileBOLT CARRIER GROUP: Prismatic heavy phosphateHANDGUARD: Octagonal free float slim with full size picatinny with diagonal cut – CNC machined – M-LOK System – full size barrelTRIGGER: MIL SPEC with lightweight springsSTOCK: Tube MIL SPEC collapsible