GG&G AGENCY Sling Adapter Looped Ambidextrous. Some of the recoil tubes being produced are smaller in diameter than the originals or Mil-Spec units. With this design by GG&G Tactical securely fastening onto the castle lock nut various size recoil tubes are no longer an issue. In addition the new design does not interfere with the charging handle operation even the larger units like the Gas Buster. The looped versions are specifically designed to accommodate the HK style quick clips or snap hooks. The Agency Rear Sling Adapters by GG&G Tactical were developed because certain government agencies established policies indicating that if a tool needs to be used to remove a part of the weapon to install a new accessory it cannot be done unless the gun is sent to the agency's armorer or gunsmith for the installation. This caused a major problem for some agencies looking to update their weapons due to time constraints and the absence of local agency armorers. The GG&G Agency Looped Rear Sling Adapter only requires that the rear assembly of the collapsible buttstock be removed. No tools required. The stock sling adapter then slides over the tube and once in proper position securely tightens around the castle lock nut as shown in the photos. Specifications for GG&G Agency Rear Sling Attachments Collapsible Stock - Looped: Manufacturer: GG&G Country of Origin: USA Package Contents: GG&G Agency Rear Sling Attachments Collapsible Stock - Looped We offer a complete line of GG&G Weapon Accessories. For our complete selection of products by GG&G Tactical on sale please visit our GG&G Tactical page. For more Weapon Accessories please visit our Weapon Accessories store section.