Mechlabs XX-MOD HPA Drop-In Engine Color:Black On one side

On one side

There is almost no resistance to the trigger

Jaeger Precision speedloader adapter for MWS PMAGS

you know how expensive greengas can be

I've tested this engine myself

Mechlabs XX-MOD HPA Drop-In Engine Color:Black On one sideThe new XMOD engine from Mechlabs is here! Turn your AEG M4 into a modern highspeed HPA marker with this drop in kit. This engine is ready for install into a variety of AEG M4 bodies. The X MOD engine is a fully mechanical HPA engine, that completely replaces the original AEG Gearbox. Featuring both semi auto and full auto, this HPA engine is sure to work for everyone. The triggerpull is amazing and feels like a high end AEG with crisp triggerbreak.