What set does this light grey 2x8 overhanging brick with a 10 on the side belong to?
Confirmed that this is not LEGO, but Mega Bloks.

http://gamearn.me/mega-bloks-tank/mega-bloks-tank-legends-battle/

Not sure if it is from this set specifically (looks like it might have some stickers to add the camouflage or yours comes from a similar set).