It's frustrating to read a young writer who leaps into the middle of a controversy with no historical context whatsoever. The first restriction of any kind is the machine gun law of 1934. No general restriction ever existed until after 1968.
When I was young my friend and I carried a pistol across the campus of an Ivy League university to an indoor range to shoot. NOBODY thought this was in any way unusual. Kids were given rifles and shotguns for Christmas, ordered from the Sears catalog.
Chapman is allowing himself to slip down the slippery slope with the likes of Feinstein and Obama. No attempt to "infringe" this right should be considered reasonable or, in fact, necessary. Laws against murder are sufficient.