For years, gun laws had grown less restrictive. But some gun rights advocacy has been curtailed after the Trayvon Martin shooting, which has provided ammunition for gun control groups. ATLANTA - Will Americans leery of a decade of gun rights expansions stand their ground over the Trayvon Martin case? The Feb. 26 shooting of the unarmed teenager in Sanford, Fla., by neighborhood watch captain George Zimmerman, and the initial police decision not to charge Mr.... (GunPolicy.org)