HAO's Marui MWS BCG-steel ver is made from the carbon steel with Electro-deposition finishing.

 It comes with the standard Alloy made bolt end.

HAO 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 !