They want something to be done about guns and the head guy (cannot remember his official title) is refusing to even talk about it. So they are peacefully protesting until the guy agrees to start a discussion. It's more complicated than that, but that's just a quick run through
I was looking for more info on that bill. Interesting that the democrats wouldn't vote for that one. It really was common sense legislation. What they want though is to give a bureaucrat the power to revoke your rights at will without involving the courts.
As far as I know the proposals in the senate were amendments to routine spending bills. The house has (what's her name- sorry no time to look it up at this moment) working on a bipartisan proposal that is rumored to mirror the republican senate proposals.
Except for the fact that democrats recently voted down two Republican gun control bills that gave them pretty much all they wanted except for requiring that due process still be enforced. The fact that democrats are calling due process a problem is quite telling.
Source: http://www.breitbart.com/big-government/2016/06/16/joe-manchin-lets-mask-slip-due-process-killing-us/