This was after Sandy Hook, sadly Biden failed to get the House to even take up this bill...but below is information that shows his long term committment for gun control...he had pushed for it early in the Obama administration. But of course the house was on fire, the economy had to be dealt with.
...'After Biden wrote the Violent Crime Control and Law Enforcement Act in 1988, Republicans quickly filibustered, blocking the bill for four years. He steered "the Biden crime bill" through the lengthy filibuster by negotiating with Republicans and making revisions. "Every single line in that bill was written with every single major Republican a part of it," Biden said in a September 12, 1994, interview on the Charlie Rose show.
The Clinton administration and then-Sen. Biden repeatedly refused to make concessions that would have jeopardized the substance of the act, even after debate over the amendment we know as the federal assault weapons ban imperiled the entire bill. Instead of backing down, Biden took on Republican Sens. Phil Gramm and Orrin Hatch and faced opponents attacking the bill as taxpayer-funded "dance lessons and midnight basketball for robbers and rapists."...
...When the bill foundered in the House, Biden persevered. It reached President Clinton's desk thanks to an unexpected, eleventh-hour push from a "Lost Battalion of Republicans" led by Rep. Mike Castle of Delaware. He'd been swayed during a series of meetings with the House Speaker and other House Republicans, at which Biden was the only Senator in attendance.
The resulting legislation banned the manufacture of 19 types of semi-automatic firearms and criminalized the possession of high-capacity magazines. The process taught a critical lesson: When otherwise "pro-gun'" lawmakers have to choose between a crime bill including a gun ban and inaction, it is more than possible for them to vote to protect Americans. Unfortunately, the assault weapons ban expired in 2004...... Since then, numerous lawmakers, including Joe Biden, have tried and failed to get the ban renewed..
...Biden will likely support a new ban on assault weapons and push for improvements. His 2007 Crime Control and Prevention Act would not only have renewed the ban but required background checks for all gun purchases, closing the "gun show loophole.'" Biden has also called on Congress to address the relationship of mental illness to violence in the wake of the Virginia Tech shootings...'
https://www.cnn.com/2012/12/19/opinion/buckwalter-poza-biden/index.html