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Any pro tips on how to fix this cotter pin? It's spread to far apart and wouldn't slide but about half way in... sucks because I had to steal the one from my UC bcg to get the Fathom back together.

I know if I'm only worried about cotter pins then the fathom is obviously GTG, but still I wanted this thing to run outta the box

Glad you got the BCG! The cotter pin will fit, but it is just really tight. Once you get it through the first hole, rotate the cotter pin 90 degrees or so and try and push it the rest of the way in. They all go in because I check them when I break them down, but the tolerances are tight as hell.

Also give a look from the back of the BCG to make sure the cotter pin is level before pushing through the second hole. Once they are in, they don't move around.

After a few range trips it should be good to go. If for some reason you can't get it in, I'll send you a cotter pin.