Cybertech is my main money maker. Armstech is the one that doesn't pull its weight. The barrels sell but not highly profitable. I can't give away any ranged weapons.
I restate: there are ways of making very good money indeed off armstech. Think about what else you can make as an armstecher and check the prices on GTN. Hint: lower level stuff can be much
more profitable than end-game.