Definitely……metal! Hop-ups are one of several internal AEG parts that take the most stress during firing, plastic hop-up are generally just a bad idea. In fact, the only guns that tend use plastic hop-ups are lower end AEGs, like Echo1, JG, CYMA, etc. etc.
EDIT: UrbanMarine, your right. Higher-end gun like TM generally use high quality materials, but MOST bands that use plastic hop-ups are of extremely low quality.
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Last edited by Archer; 07-30-2010 at 06:16 PM.