Roy Noji of PolarStar has given Thumpy the privilege to post more photos of their HPA Gearbox Conversion  prototype for you to checkout. This easily makes your AEG into an HPA-ready airsoft gun which you can adjust power according to the game requirements. What's more, Thumpy says that they're also planning a gas blowback version, which should be a welcome thing to give more realism to your converted HPA airsoft gun. No further details on the last tidbit and this enables PolarStar to jump into the lead for an HPA M4 airsoft gun as other HPA kits are mainly for AK and M249 variants.