PIRATE’S PLAGUE Two types of Pirate’s Plague adapters are available: a 12 GAUGE to .38, and a 25mm to .38. These adapters are created by an offshore delivery captain and described as a discreet no hassle solution to carrying a weapon on board. Because the Pirate’s Plague adaptors are not weapons, it is not illegal to possess them. However, according to California Penal Code 12021, this is a firearm.