ERGO GRIP GAS BLOCK .750

LOW PROFILE ADJUSTABLE AR-15 FEATURES-Designed to fit under the Ergo Modular & SuperLite™ Rail System, as well as most other manufacturer's free float handguards-Adjustments are made via a 5/64" set-screw & a 5/64" retaining screw ensures the system remains locked, no need for Locktite