All they'd have to do is fund the prosecutors since they currently only prosecute like 3% of the known gun crimes federally. Semi-sarcastically, defunding the ATF might actually help (see Ruby Ridge, Waco, walking guns at the border, full autos stolen from ATF agents, etc). If you know anyone who has worked with federal LE, ATF and DEA will typically show up at the top of their "cowboy" list.