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oh wait, I forgot about audio since a new sound file plays every time you cock/reload/fire a gun with a skin with effects, so to be very exact, yes it would require ever so slightly more processing power and could lower your fps, but audio files are extremely small file sizes and would practically make no noticeable affect on your pc's ability to perform (lots of people ik regularly play music simultaneously while playing the game anyways)
this is some bullshit. its about rendering the polygons that the gun has, along with lighting and some other things. a more compliacted model will realisitcally use some extra processing to render the model. if it was just based on pixels every game at the same res would have the same graphics requirements