Hm... I'm going to post a weapon suggestion in the dev forum later for a mass driver cannon for junkers =P
It was an old weapon type from wing commander 3/4 - didnt fire too fast, but it basically accelerated a small clump of solid mass (for junkers, a big chunk of scrap metal) and fired it towards the target like a cannonball.
I'm thinkin it would be a good particle weapon, and barragers suck right now. Then again, it could be made a torpedo-slot weapon... hm...