Prometheus EG Barrel 363mm for M4A1, SR16, SG551

Prometheus EG Barrel 363mm for M4A1, SR16, SG551 For Tokyo Marui M4A1, SR16, SG551 Airsoft Gun High grade precision barrel at 6.03mm diameter for extra power and precision shooting Choose this barrel to suit your model For custom upgrade user, you can choose a longer barrel PROMETHEUS EG Barrel by LAYLAX (JAPAN) NOTE: You can always choose a longer Barrel if you have a extended Outer barrel installed