Probably going back to 1-handed arm cannons, actually, I can just upload a 9.1 patch for that right now. My internal test group likes them more when they can pair them with a shield or grappling hook, or sword. Likewise, I have been comparing them to the wrong guns. So it's okay for them to be stronger as one-handed weapons (which was my reasoning for making them two-handed, they felt weak in the new stable). I'll set them to one-handed without changing anything else for a while and see how that goes in testing. I haven't been able to reproduce this issue in my testing. When you are playing multiplayer, is it on a server? Is it local? Everyone involved must have the mod or the arm cannons will not function as intended.