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Even if gearbox is builded and tested by us, for instalation you need skilled technican or experience
GREEN EDITION
Gearbox is builded for 350 fps/1.2j
Every gearbox is builded and tested by Retro ARMS.
Tested on DELTA ARMORY R15 FREYA, RA HOP UP CHAMBER and Warhead 31k motor
Results depends on many factors
