The TRUGLO Fiber Optic AR-15 Front Gas Block Sight is what you need for your AR-15. This sight is designed to mount to an AR-15 Gas block. This sight features a green fiber optic that has a push button to illuminate the sight in total darkness. This sight includes a sight adjustment tool.
Specifications and features: TRUGLO Fiber Optic AR-15 Front Gas Block Sight TG115
Extra long, super bright, protected green fiber
Integral mount for Mil-Spec. 1913 Picatinny rails
Designed to mount on front gas blocks
Click elevation adjustment
Includes sight adjustment tool
Includes optional push-button light for use in complete darkness
CNC-machined construction
Green front
Black
Uses three SR60 batteries
Fits:
AR-15 and similar with lower gas block height