The Indexer was created in response to user requests for an M-Lok version of our Finger Stop for Picatinny rails. It features a slim front-to-back profile with a slight radius on both faces. Versatile in its application, the Indexer is primarily designed to be placed between two fingers, typically the index and middle fingers. This forward positioning on the handguard ensures it doesn't obstruct transitions to kneeling or prone shooting positions, where the support hand often shifts backward. When used in this manner, the Indexer helps pull the rifle securely into your shoulder, enhancing control during shooting. Its wider, flatter profile also makes the Indexer an effective hand stop or barricade stop, while serving as a forward limit to prevent your fingers from slipping off shorter handguards onto a hot barrel or suppressor.**Requires an IP20/T20 Torx wrench for installation (not included).