ACTION SL-MK4 220mm Barrel Kit Set for SLMK4 AEG

ACTION SL-MK4 220mm Barrel Kit Set for SLMK4 AEG Full Metal Constructed Steel 220mm Outer Barrel Metal 370mm Inner Barrel With Hop-up Chamber Suitable for ACTION SL-MK4 Series Airsoft Electric Gun AEG Rifle Super rigid construction for high end upgrade user