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I had a hard time finding the last sniper rifle piece, and i'm sure it was because I picked them up out of order. I know some may think it's not a glitch but if it is not. Then why was the icon half way across the map from where I found it?
The diamond icon only takes you to the general location (it is a hunt for parts after all) I found the Dahl headlands one was the hardest, I must have looked at the actual location loads of times but never saw it until I started jumping around like a freak from frustration :)