Officers investigate the scene after a shooting at She's a Pistol, LLC, a gun shop in Shawnee, Kan., Friday, Jan. 9, 2015. Police said three suspects and a business owner have been critically injured in a botched robbery at the Kansas City gun shop. (AP Photo/The Kansas City Star, Tammy Ljungblad)

Defendants argue self-defense in Kansas gun store shootout

One of the four men charged with first-degree-murder in the killing of a suburban Kansas City gun store owner is arguing that he acted in se…