No, I could not. Aquiring them requires annoying, boring grind, and I am not here to do that.
Have you tried it?? Do you know it's boring, or are you just judging by the complaints of others?
In truth, it doesn't take long to unlock Gauss Cannons, AT ALL. You can do it in an hour or two even at a leisurely pace, and it isn't particularly boring, at least not the first couple of times you do it. The Guardian Structures are cool environments, and the task involves combat with unique extraterrestrial enemies, and is more engaging and interactive than MOST things in this game. Most of the complaints I've seen are from completionists trying to unlock multiple things/everything in a oner. The biggest enemy of fun is between the keyboard and the chair in those cases.
If you only want the Gauss Cannons, you won't have to do the actual Guardian Structure activity more than once. You MIGHT have to make a second trip to another site to mop up the other Guardian mats, depending on what spawns (or relog if you like), but that's it.
Medium Gauss Cannons only need a single Guardian Weapon blueprint, so only one "puzzle" quest needed, a smattering of Guardian bits and bobs you'll easily find at any type of Guardian site, and one or two normal mats you likely already have. Small ones are even easier.
Don't take others' complaints about this game too much to heart. Years ago, I put off trying engineers for a long time, because I heard all the horror stories. And when I finally tried it, I realised I had ALREADY, unknowingly saved up enough materials for several medium-to-high end modifications while just playing the game. An hour later (mostly spent travelling around Engineers) and my ship felt twice as deadly as before.
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