Diamondhead’s Polymer Diamond Front Sight is designed for all AR15’s and Modern Sporting Rifles. When paired with the Polymer Diamond Rear Sight it is suitable for firearms fitted with a Diamondhead VRS handguard or any M1913 Picatinny Rail System. - Note: NOT SUITABLE FOR GAS BLOCK SIGHT BASES (due to heat issues) - Advanced Polymer/Composite construction for??strength light weight & exceptional durability - NiteBrite™- Photoluminescent Inserts (the low-cost alternative to Tritium) - can be charged by natural light or with a flashlight - Spring-loaded sight flips up quickly with the push of a button stays up securely and folds down flat - Patented ?Diamond-shaped Upper Housing for fast alignment with the Polymer Diamond Rear Sight - Easy Elevation adjustment (with no tools)