Why hold on? Just cash it in for the legendary marks. Glimmer is way too easy to max out. Don't save it.
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If you don't turn it in you can wait and the perks available change every week.
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Focused fire is only good on the max fire-rate autorifles, and it's basically an aggressive ballistics/extended mag. Get it with persistence and focused fire and you basically have an improved Fabian Strategy.
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It took 2 months for gunsmith to sell it again, doubt he wants to take the chance he'll take so long to sell it again.