Hoppe's 9 Convesion Shotgun Adapter .17 to .22 Caliber Stainless. Opticsplanet is an Authorized US Distributor for Hoppes Gun Cleaning. All Gun Cleaning by Hoppe's from our online store come with Full Manufacturer Warranty. For a full line of Hoppes Gun Cleaning and other products by Hoppe's on sale please visit Hoppe's page on our website. For more brand name Gun Cleaning please visit our Gun Cleaning store section. Specifications for Hoppe's 9 Convesion Shotgun Adapter: Manufacturer: Hoppe's 9 Fabric/Material: Aluminum Color: Stainless Additional Features: Fits Shotgun Package Contents: Hoppe's Rifle to Shotgun Thread Adapter 1401 Converts 8 x 32 Female to 5/16 x 27 Female Thread Hoppe's Rifle to Shotgun Adapter 1401