I'm at the same part as you, I believe that the kills required is around 200 and the rare materials only have 5-10% drop rate
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Dude it's 500 kills and the drop rate is somewhere between 5-2%. It's really tedious. Needs to be changed IMO.
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It took about 4 hours to get the materials lol now I have to wait for the gunsmith on Wednesday
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I'm fine with it either way