Magpul Thumb Shelf Features The Magpul Thumb Shelf mounts to an octagonal aluminum M-LOK handguard using a single M-LOK slot keeping the installation simple and low profile. Its ribbed curved top is shaped to improve thumb contact during recoil giving the support hand thumb leverage against muzzle rise. This leverage helps the shooter maintain a consistent grip reference point which translates into faster recovery between shots and quicker follow-up shot speed. The shelf also provides a bracing point when the support hand is braced against a barrier or other support during a shot. Because the design is ambidextrous the Thumb Shelf works equally well for right and left handed shooters without needing a mirrored version. It is molded from Magpul s proprietary polymer a material chosen for its durability and consistent performance under repeated use and recoil impulse. The matte Black finish blends with most handguard colors for a factory-look installation. Compatible specifically with octagonal M-LOK handguards and forends the Magpul Thumb Shelf is a simple effective ergonomic upgrade for sale at GrabAGun. Magpul Thumb Shelf Specifications Manufacturer: Magpul Model: Thumb Shelf Compatible Hosts: Octagonal Aluminum M-LOK Handguards Color: Black Material: Polymer Mount Type: M-LOK Hand: Ambidextrous Length: 1.55 Weight: 0.40 oz Available At: GrabAGun