Tiger Rock AR-15 Extended Bolt Catch Release Lever Black. These AR15 Lower Parts by Tiger Rock greatly increase bolt release operation as it moves from a vertical (down) position to a horizontal (up) position. This Tiger Rock AR-15 Extended Bolt Catch Release Lever w/ Ambidextrous Grip & Knurled Surface will work with standard AR-15 lower receivers by adding the functionality of an AR-15 selective blowback system. For a great way to make your AR-15 more versatile choose the Tiger Rock AR-15 Extended Bolt Catch Release Lever. Specifications for Tiger Rock AR-15 Extended Bolt Catch Release Lever: Manufacturer: Tiger Rock Color: Black Finish: Anodized Fabric/Material: 6061-T6 Aluminum Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Condition: New Package Contents: Tiger Rock AR-15 Extended Bolt Catch Release Lever Tiger Rock BAL: AR-15 Extended Bolt Catch Release Lever