HAO's Marui MWS BCG-ecoline is made from the 6061 alloy with Hard Anodizing finishing.
 
It comes with the bearing and steel made weight block 
 
We  also added the HAO developed BCG enhanced sticker. Which makes the problem of jamming caused by worn off BCG polymer cap disappear.
 
Once the cap wears off, it loses the support between the BCG and the receiver. It will cause the BCG lift up during the travel through the magazine BBs feed and jam.
 
The sticker helps support and also smoother the travel ! Make your MWS more durable !
 
Anodizing / surface treatment disclaimer from Geissele for reference :
https://geissele.com/anodize-shade-variations-and-finish-methods
 
 
Made in Taiwan
BB type: 6mm 0.2g BBs
Power source: Green Gas 9Kg
Power: 90 m/s = 0.81J with 0.2g BBs
J / cm2:  2.835 J/cm2
No primer using function