Blackcat Airsoft 30 / 120 rds M4 Magazine Inner Case Assembly Ver. 2 for Systema PTW (5pcs / Box)

Blackcat Airsoft 30 / 120 rds M4 Magazine Inner Case Assembly Ver. 2 for Systema PTW (5pcs / Box) This Magazine cases can Upgrade Your Magzine which you can change from 30 to 120 rounds Suitable For Systema PTW Series Airsoft Rifle Magazine