Prometheus 6.03mm EG Inner Barrel for Marui M4A1 MWS GBB (370mm)

Prometheus 6.03mm EG Inner Barrel for Marui M4A1 MWS GBB (370mm) For Tokyo Marui M4A1 MWS Airsoft Gas Blow Back GBB Rifle High grade precision barrel at 6.03mm diameter for extra power and precision shooting With a precision barrel, you can opt for higher grade precision BB's for greater accuracy Choose this barrel to suit your GBB model For custom upgrade user, you can choose a longer barrel Some players use this as one of many tuning tools for a quick 5 - 10 FPS bump for there gun. PROMETHEUS EG Barrel by LAYLAX (JAPAN) Length: 370mm NOTE: You can always choose a longer Barrel if you have a extended Outer barrel installed