http://www.007airsoft.com/products/htm/consumables.htm
In this link there are some 0.36g Aluminum Coated Sniper BB's. I personally would not use them but Im curious if people actually do.
I would assume they are only for target shooting but like I said I was curious if people actually gamed them.
I know the ESS stuff is meant to stop a 12 gauge but Id be a little pissed off if that popped off my goggles

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