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depending on the weight of the metal bb (steel (8.05 g/cm3) is roughly 8 times as dense as ABS plastic(1.024 g/cm3))- you will probably get a velocity that is about 8 times slower. Assuming your gbb fires at 300 fps with 0.2 g abs BB - that will corresponds to 38 FPS with the steel BB. The bb will be sufficiently slow to dodge and will have very poor range. It will most probably damage the hop-up.
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