Magpul Thumb Shelf Features The Magpul Thumb Shelf gives the support hand a consistent repeatable reference point on the handguard which helps shooters return to the same grip shot after shot. Its ribbed curved top is shaped to improve thumb contact during recoil translating directly into better muzzle control as rounds are fired. The ambidextrous design means it works identically whether mounted for a right or left-handed shooter and it also provides useful leverage when the rifle is braced against a barrier. Molded from Magpul s proprietary polymer the shelf is built to handle the wear of regular range and field use without breaking down. Installation uses only a single M-LOK slot so the Thumb Shelf adds this support-hand feature without eating into rail space needed for lights lasers or other accessories. It is purpose built for octagonal aluminum M-LOK handguards and forends so fitment is straightforward on rifles already running that handguard profile. At 1.55 inches long and a mere 0.4 oz the shelf disappears into the overall weight and footprint of the rifle while still doing its job. For shooters chasing faster more consistent follow-up shots on their M-LOK equipped rifle the Magpul Thumb Shelf in Modified Coyote Brown is a low-cost high-value addition available at GrabAGun. Magpul Thumb Shelf Specifications Manufacturer: Magpul Model: Thumb Shelf Color: Modified Coyote Brown Material: Polymer Mount Type: M-LOK Handedness: Ambidextrous Length: 1.55 Compatible Hosts: Octagonal Aluminum M-LOK Handguards Weight: 0.4 oz Available At: GrabAGun