This is why I believe amendments to bills in Congress should not be allowed. I would personally be ok with better background checks and closing gunshow loopholes, but I'm not ok with restricting magazine capacities. Same deal with the 'protect Monsato' amendment to the sequestor bill--it would never have passed on its own (hopefully) so they tack it on to sequestration which omgomg has to pass. Lots of other government pork would be eliminated by this as well.
The biggest problem imo with gun legislation is you have a bunch of legislators who have no idea what they're talking about pandering to their constituents who have no idea what the crap they're talking about, such as
this example. Therefore, nothing meaningful gets done.