I just completed my 250th strike. 250 strikes and days of my life wasted and yet the riskrunner Catalyst has yet to drop. The only catalyst I want in the actual game. I've gotten many other catalysts for other weapons that I never touch. ( Here's looking at you rat King.)
But come on. 250 strikes? This is a bit unreasonable. I'm starting to wonder if maybe the catalyst is just a rumor.
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Try inspecting the gun in collections or the gun itself. Sometimes you might already have the catalyst without knowing it since the screen always gets cluttered.