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The Tessarct Ark kit comes with Tesla cannons as default, but the index also allows gauss cannons and particle beamers.

FW link

I put magnets on the tesla cannons, and now I'm looking for ways to supply gauss cannons and possibly particle beamers (not a very viable option in 8th, except saving points)

Gauss cannons from the destroyer kits would be one possibility, but I don't really have any destroyers to spare. The immortal/deathmark kit would be another good option, the gauss blasters could be built to resemble something when I build deathmarks.

Just thought I'd check if anyone had any ideas or had done this already?

As long as you magnitize what comes with the kit, just wait till you get some 'extra' weapons as you collect your army. (Or trade with a friend or bits buy)