There are a couple of interesting posts on THR.US by Schrader's Significant Other. In a nutshell, it seems that 40 years after Schrader plead guilty to a misdemeanor assault, the Maryland AG made any crime punishable by up to 2 yrs in prison automatically a 2-yr sentence. Thus, retroactively, Schrader became, in essence, a convicted felon for NICS purposes.
Interesting reading posted by "coolpillow" on THR:
Violence is an ugly thing, but not the ugliest of things. The decayed and degraded state of moral and valorous feeling which believes that nothing is worth violence is much worse. Those who have nothing for which they are willing to fight; nothing they care about more than their own personal safety; are miserable creatures who have no chance of being free, unless made and kept so by the exertions of those better than themselves. Gary L. Griffiths, Chief Instructor, Advanced Force Tactics, Inc. (Paraphrasing John Stuart Mill)