Magpul Thumb Shelf Features The Magpul Thumb Shelf gives the support hand a consistent reference point on the handguard letting the shooter return to the same grip position shot after shot and get back on target faster following recoil. Its ribbed curved top is shaped specifically for improved thumb contact which translates into better muzzle control and leverage against muzzle rise during rapid strings of fire. This leverage also helps when the shooter braces the rifle against a barrier or support giving a stable point of contact beyond the handguard s rounded profile. Because the design is ambidextrous it functions identically whether the rifle is run as a right handed or left handed shooter. Built from Magpul s proprietary polymer and finished in Flat Dark Earth with a matte surface the Thumb Shelf is both durable and visually consistent with Magpul s broader line of furniture. It uses only a single M-LOK slot for mounting keeping the handguard s real estate largely open for other accessories like lights or slings. The design is compatible specifically with octagonal aluminum M-LOK handguards and forends so shooters should confirm their handguard shape before installing. At just 1.55 inches long and 0.40 ounces this lightweight accessory is a simple no tool upgrade for AR owners seeking better muzzle control. Magpul Thumb Shelf Specifications Manufacturer: Magpul Model: Thumb Shelf Compatible Hosts: Octagonal Aluminum M-LOK Handguards Color: Flat Dark Earth Material: Polymer Mount Type: M-LOK Finish: Matte Length: 1.55 Handedness: Ambidextrous Weight: 0.40 oz Available At: GrabAGun