Laser Ammo Adapter 20 Gauge Shotgun. The 9mm SureStrike laser cartridge inserts easily into the Laser Ammo SureStrike 9mm to 12ga Shotgun Adapter and is immediately ready for use The 9mm SureStrike laser cartridge is fitted into the detachable capsule foreend which is screwed shut with the end cap. The capsule is then inserted into the chamber of a shotgun. This feature is especially convenient for police officers who can use the same laser bullet to train with both their service pistol and shotgun. The Shotgun adapter must be used with a 9mm Laser Cartridge. The cartridge is purchased separately it is not included with the adapter. Specifications for Laser Ammo SureStrike Adapter 9mm to 20 Gauge Shot Gun: Manufacturer: Laser Ammo Caliber: 20 Gauge Gun Type: Shotgun Quantity: 1 Features of Laser Ammo SureStrike Adapter 9mm to 20 Gauge Shot Gun: converts your 9mm cartridge to a 20G Shot gun caliber Package Contents: Laser Ammo 20 Gauge Shot Gun SureStrike Adapter 20 Gauge Shotgun Adapter Features/Specifications: convert your 9mm SureStrike to 20G caliber to use with your shot gun. Included Accessories: 20 Gauge Shotgun Adapter