Promotional 401 Sandblast Gun Complete The 401 sandblast gun is supplied as standard on our engraving cabinets. Over a period of 2 to 3 years the gun may become worn and holes appear in the main body of the gun but this will depend on the useage of the sandblasting cabinet. The gun is easily replaced by disconnecting 2 pipes. The majority of cabinets supplied by other manufacturers will need adapting to fit the 401 gun.