I've noticed it does throw you the odd bone when you cash in weapon parts at the gunsmith. Occasionally you get a core from dismantling them. But one mans occasionally is another mans never in this Rng lottery!
Outside of that, the finest matterweave consumables are good for cores, but they're rare in their own right!
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Yeah I was also gonna mention that, the matterweave is nice, but it would be better if it persisted for more than 1 core. similarly to old school Three of Coins.