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Actually, I'll be more specific to alleviate any confusion: "plastic" here refers to the plastic in the XMods. Also, I don't mean to make a blanket statement that aluminum is heavier than plastic; there are hundreds of kind of plastic and a lot of aluminum alloys out there. A cursory check, though, shows plastic with an average density of about 1.0 g/cc, whereas various flavors of aluminum alloy range from 2.0 up to 3.5.
There may be some GPM part that is lighter than its plastic counterpart, but I'm not stripping it down to measure each item. However, the rear deck plate, for example, is noticeably heavier. The plastic one weighs 1.3 g, while the GPM one (made of thicker material) comes in at 2.7 g. Also, the GPM screws are larger than the stock XMods screws
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