The PolarStar Airsoft folks are expanding the line for their HPA-powered Fusion Enginer Drop-In Gearbox as they're now about to release the gearbox for Version 3 airsoft guns. Now AK players will get to taste PolarStar after the M4s and M249 airsoft guns. "We're getting closer! The Version 3 is going through the final stages of prototyping and we are currently working on compatibility between brands/models. Here we have it in ECHO 1's new AMD-65. Still some tweaking to be done but Santa might just be bringing some V3 Fusion Engines down the chimney this year."