Fortunately House Rules aren't laws and can't really be enforced. Even if they did try to enforce it this rule would easily be defeated in court since it's a public building and the state constitution makes it clear that firearms can't be restricted.
It's really dumb that they even waste time on this kind of stuff though. I read an article yesterday and one of the legislators wanting this rule said he doesn't want people walking around with automatic weapons. Just goes to show that the people making our laws don't have any idea what they're talking about.