Airsoftjunkiez show you how to install the HPA trigger from SPEED Airsoft which they have them in stock... "The new SPEED HPA triggers will incorporate dual adjustment set screws which will enable a trigger pull under 1mm with ease.

SPEED Airsoft are releasing more products designed for HPA-powered airsoft guns with the latest being the HPA Tunable Triggers... "SPEED Airsoft releases a sneak peak of their new HPA triggers under development to be released soon, which are designed to work with Polarstar and Wolervine HPA conversion systems.