Originally Posted by goduranus
I did a quick search online for hard and dense materials that come in 6mm balls, and found tungsten carbide ball bearings. Over 1.5 gram a piece.
Now I have to find a tougher spring and see if I can reinforce the shooting mechanism.
With BBs that heavy, the trajectory will be like "peeing" even with a very high power AEG. (higher power than you can achieve on the small space of that tank.)