Guntec USA AR-15 Extended Bolt Catch Release Anodized Grey. Their goal is to distribute excellent quality at an economical value. Specifications for Guntec USA AR-15 Extended Bolt Catch Release: Manufacturer: Guntec USA Gun Model: AR-15 Fabric/Material: T6 Aluminum Length: 4.75 in Hand: Ambidextrous Condition: New Features of Guntec USA AR-15 Extended Bolt Catch Release Ergonomic Contoured Design Extends The Bolt Release Option To The Right Side Of The Weapon Lightweight Quick Bolt On Design Quick One Hand Acquisition Allows For Faster Reloading Package Contents: Guntec USA AR-15 Extended Bolt Catch Release Three Set Screws What firearm models does the manufacturer say Guntec USA AR-15 Extended Bolt Catch Release is compatible with? The manufacturer suggests that Guntec USA AR-15 Extended Bolt Catch Release is compatible with AR-15Guntec USA GT-EBR-GREY: AR-15 Extended Bolt Catch Release Anodized Grey