 Ballew's only shot struck the wall at an angle to the hallway at floor level in a downward direction.While one grenade was explicitly marked "inert," all were unloaded dummy or inert grenades of the type sold at Army-Navy surplus stores as curios or relics.Such grenades were classified by then (1971) and later (2009) ATF regulations as non-weapon curios and may be owned as military souvenirs without federal registry Of the five grenades, two were bookends for a collection of military books and three had been rigged to pop caps