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