could be describing the noise of the winding spring when it unwinds itself cause you're low on BBs... a high cap will not feed every single round, that's the nature of the highcap, anywhere from 10-30 depending on type of gun. If the gun just makes that sound at the end of the magazine instead of every shot, then it's not motor height.
If it's screetching every shot, get it adjusted.
edit... what nooblord said.
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