3D Printed Airsoft HPA Engine
OptimusPrime
12 May 2018
Tom Tong shows his 3D printed Airsoft HPA engine with 2 stage trigger and Arduino FCU prototype in this video... "My finished prototype! Now to design and print the sub machine gun shell to fit it in. Plans to add a shot / ammo counter that will count down to zero as the BBs are fed into the hop up chamber. More to come..."