A good take by WYSHTECH Airsoft on the Solink Airsoft SR25 Helical Gearset which includes a test of product... "The Solink Airsoft SR25 Helical Gearset is built for platforms using 19-tooth sector gears like Cyma, A&K, and others—not standard AEGs. In this video, I install and test it inside a Cyma Platinum SR25 and compare it directly to the stock gearset. I’ll break down its build quality and include performance results to help you decide if it’s worth the upgrade."