PistonsAEG stock pistons wear down rather quickly because of their plastic build. Airsoft Megastore offers a large selection of metal and polycarbonate pistons as an upgrade. From brands like APS, G&G, SHS, Madbull and Prometheus, Airsoft Megastore’s selection of pistons also include types for Version 2 and Version 3 gearboxes. Some models also come with steel teeth to provide a perfect catch onto the sector gear. While an airsoft technician is highly recommended for installation, upgrading your piston is a must to increase your AEGs reliability and performance.