High quality full metal precision barrel with high durability Fits Marui & compatible with most G36C, P90, CAR15, SIG552 airsoft AEG rifles Prometheus series barrel manufactured by Laylax Barrel measures with a length of 247mm Inner barrel has a tightbore diameter of 6.03mm for higher velocitySpecifications: Brand Prometheus Build Full Metal Inner Barrel Diameter 6.03 mm Inner Barrel Length 247 mm Compatibility Marui and Most G36C, P90, CAR15, SIG552 AEGs (ideal for) Color STEEL 1X Airsoft Inner Barrel