G&G Armament AEG Power Spring (GG09-018)
Guarder AEG Tune-Up Spring - SP100
Guarder AEG Tune-Up Spring - SP110
Guarder AEG Tune-Up Spring - SP120
Guarder AEG Tune-Up Spring - SP130
Guarder AEG Tune-Up Spring - SP140 (GG08-09)
Guarder AEG Tune-Up Spring - SP150
Guarder AEG Tune-Up Spring - SP160
Guarder AEG Tune-Up Spring - SP170
Guarder AEG Tune-Up Spring - SP85
Guarder AEG Tune-Up Spring - SP90
Lancer Tactical AEG Irregular-Pitch Upgrade M100 Spring [320-390 FPS] (GG09-07)
Lonex AEG Tune-Up Spring - M100SP
Lonex AEG Tune-Up Spring - M110SP
Lonex AEG Tune-Up Spring - M120SP
Lonex AEG Tune-Up Spring - M130SP
Lonex AEG Tune-Up Spring - M140SP (GG10-01)
Lonex AEG Tune-Up Spring - M150SP
Lonex AEG Tune-Up Spring - M170SP (GG10-01)
Lonex AEG Tune-Up Spring - M90SP
Prometheus AEG Non-Liner Tune-Up Spring - SP100
Prometheus AEG Non-Liner Tune-Up Spring - SP110
Prometheus AEG Non-Liner Tune-Up Spring - SP120
Prometheus AEG Non-Liner Tune-Up Spring - SP135