Mark Serbu crafts an Apocalypse hardware store gun build (VIDEOS)

Heavy weapons gun guru and noted firearms engineer Mark Serbu came up with an 11-part spring-operated slam-fire pistol that uses .22 nail gun blanks to fire 3/8-inch ball bearings.

Made from ASTM A36 carbon steel plate, a scrap piece of .22 barrel, and a handful of parts from a neighborhood hardware store, Serbu came through with a working single-shot design complete with a trigger.

For more footage of the “RN2238” in action, Royal Nonsuch put it through its paces below.