Metal rounds are useless in an airsoft gun. If you go that route, then buy something else like .22, or a pellet gun. Even upgrading an Airsoft platform to handle metal is quite a waste.
I've seen silica BB's damage first hand. Some vaginal discharge, disobeyed a game rule, and ran them; inevitably shooting a window out on one of the trucks. I really hope they found that guy.
Silicas do sail with more stability than standard rounds, but due to the basic dynamics of them, they've nearly become a useless product.
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