On assault weapons: did you know that rifles account for LESS than 1% of firearm-involved homicides in the U.S.? In 2013, rifles accounted for LESS than 290 deaths, according to the FBI's "Expanded Homicide Data Table 8". According to the same article, that year, shotguns were used to kill LESS than 310. Added up, long guns killed only 600 people that year. And this is EVERYTHING that counts as a rifle (from low powered plinking rifles and single shots to high powered hunting rifles and semi-automatic "military style" rifles) or shotgun (from single shot to semi-automatic) in statistics, so the deaths involving "assault weapons" are probably even lower Also you want to restrict those while not mentioning cutting instruments and blunt objects, which account for 1,940 and 428 deaths respectively (then again, they're work tools). Altogether, firearm-related homicides accounted for a GRAND TOTAL of 8,454 people that year. Divide that by 290,000,000 and about 0.00002915172% of the population was, in homicide, killed with a firearm that year.
Do you know what an assault weapon even is? And how gun control advocates plan any exceptions to restrictions, such as rimfire (which are quite weak) rifles and rifles with either non-detachable (such as the M1 Garand or most variants of the SKS) magazines or low-capacity single stack magazines (such as the Merkel S1, Benelli R1, and the semi-auto Browning BAR)?
I'm not even sure if people would even address loophole weapons.
A little critique to weapon laws in other countries; weapon laws actually vary greatly in Europe, from countries such as Switzerland, the Czech republic, Austria, France or Serbia having not all that strict weapon laws and/or high legal firearm ownership rate to countries such as Ireland, the Netherlands, Germany, Cyprus or Spain, all of which have comparatively stricter weapon laws, and nonsense such as "may-issue" permits/licenses ("may issue" means that the firearms authority people make the last decision as to rather or not you'll get your license/permit. "Shall-issue" means that if you meet the requirements you will get your license). Yet the former countries I described don't seem to have substantially higher homicide or violence rates than the latter countries from what I'm aware of.
I'd also like to note that there are a LOT of cases where militaries, law enforcement and government agencies in that matter have lost weapons that are often restricted to almost banned for private civilian use and ownership. For militaries, read a couple of articles called "More than 300 guns lost or stolen from Army bases over just five years", "Norwegian army admits losing 1,200 rifles", and a video called "Home Office and Police Gun Losses - How Many do they Lose?". So it won't be surprising if those types of weapons end up in the hands of criminals, militants, black market dealers and so on.
Another interesting story is New Zealand vs Australia, where the former has mostly lighter (I say "Mostly" because I'm not so sure if law enforcement would visit the homes of gun owners all that much in Australia plus the legality of antique weapons in Australia) firearms laws than the latter plus more firearms per capita, yet again, actually has lower homicide and violence rates.
Not to mention how countries in Central and South America often have stricter weapon laws than Europe or some parts of Asia and yet look at their crime and violence rates.