SHS - M130 Japan Grade Upgrade Spring for Systema PTW / CTW / DTW AEG
SHS - M110 Japan Grade Upgrade Spring for Systema PTW / CTW / DTW AEG
SHS - M150 Japan Grade Upgrade Spring for Systema PTW / CTW / DTW AEG
FCC - Velocity Main M90 Spring for PTW/CTW Series
FCC - Velocity Main M160 Spring for PTW/CTW Series
FCC - Velocity Main M140 Spring for PTW/CTW Series
FCC - Velocity Main Spring package (M90, M115, M130, M140 and M160)
