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.
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