If you can't get black spindle then you can grab yourself a 1000-Yard stare for 150 marks at the vanguard quartermaster.
It's pretty much a mini black spindle due to its similar stats, solar damage and perks.
Vanguard quartermaster 1000 yard stare perks:
Triple tap (1 round to mag for free) perfect balance and mulligan.
Black spindle perks:
White nail (3 rounds to mag from reserve) perfect balance and mulligan.
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It's good. But what really seperates the spindle is the fact you can shoot 3 or maybe even 4 more times per 100k stare reload. Since there is no reload if you hit all crits, you can easily get off the 18 round clip into the warpriest on one cycle. It's the added DPS from auto reload that makes it special.