I don't think 4.5oz is a difficult bar to clear. My Manix 2 S110V is 3 oz. A full 4" Endura is under 4 oz. Even a G10 Military is only 4.2 oz. Might get a shorter list looking for folders heavier than 4.5 oz. 
The Spyderco Air is spooky light. The Benchmade 530 is also a feather. The Ontario Rat 2 is in that same class. I just got a Kershaw Knockout in Elmax steel that's under 4 oz. Even the common Leek is under 4 oz.
The Spyderco Air is spooky light. The Benchmade 530 is also a feather. The Ontario Rat 2 is in that same class. I just got a Kershaw Knockout in Elmax steel that's under 4 oz. Even the common Leek is under 4 oz.
