HAO's Alloy-made Bolt end with guide wheel function . Weight: 30g
 
It's lightweight, and the three-wheel guiding system can hold the BCG in the centre of the buffer tube when travelling.
 
For reference: Steel bolt end weight: 83g
 
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