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Is the trigger and cog supposed to be tightly fit on the shafts (and the shafts rotate in the body), or the other way around?

I haven't fully assembled the gun yet, but the single shot trigger doesn't seem to interact correctly with the cog, the cog can't rotate past the inhibitor (no idea if that's the right word) pin on the trigger when the trigger is not depressed, so the cog basically can't rotate at all. I imagine I must be doing something wrong.