It appears Greg Hardy was an avid gun enthusiast from a list of weapons surrendered to the sheriffs department. A total of ten were listed on a form released today, most of which were automatic and semi-automatic rifles with several shotguns.
It's important to note that none of these weapons appear to be illegal, though the SAR 21 and TAR-21 require a federal firearms permit if they're capable of firing fully automatically. Turning the weapons over is part of a judge's order following his arrest and should his paperwork be in order there will be no further ramifications.
Hardy was released from custody earlier this week after being charged with assault on a female and communicating threats. The alleged victim claims she was thrown on a sofa that was "covered" with rifles and shotguns, which the above list of firearms could potentially corroborate.
There is no further update on the legal proceedings at this time and once again it's important to let the process play out.