Gun restrictions have been happening ever since the National Firearms Act was passed in the 30s but liberals don't ever talk about that. It only came about because of Prohibition and at its core is unconstitutional. They think that segmentation of restrictions is something 'new' (within the last generation I mean) and 'not dangerous' because we are still able to buy guns but if they actually understood the amount of restrictions already in place (25,000+ gun laws on the books), they would maybe reconsider their stance. Our gun rights are slowly being picked apart piece by piece in the name of 'safety'.
As an example of how the anti-gunners don't fully understand the actual restrictions on the books, someone I work with who is for legislation was unaware that you can't buy full auto firearms if they were manufactured after 1986 and if you get one pre 1986 you have to jump through all kinds of red tape. Not to mention that while I already got a thorough background check to get my CCW, I need another one to get a suppressor and another to make a short barreled rifle. One background check is too much already.