I wonder what else is in the senate version if the normally pro-gun GOP House hasn't passed it.
As I understand it, several "poison pill" amendments have been tacked on, including a functional ban on centerfire rifle ammunition.
Senate Passes Gun Control Amidst Protection For Gun Makers
From glancing at the link, it just mentions mandatory trigger locks, but I know it also has an amendment in effect calling for the DOJ or AG to study ammunition that can penetrate routine LEO body armor, which happens to include almost all, if not all, centerfire rifle ammunition. It was to deflect an amendment by the swimmer to ban ammo and weapons that can penetrate such body armor, IIRC. It's S. 397. I know the clean House version is H.R. 800. I just checked at http://thomas.loc.gov/