Meprolight FABS - Flip Back Up Rifle Sights - Aluminium -Blank Rear-Green Front Black Body Black. You can also use it as primary sight. The Mepro Fabs sights are mounted to any Picatinny rail. Specifications for Meprolight FABS - Flip Back Up Rifle Sights: Manufacturer: Meprolight Front Sight Color: Green Gun Model: Universal Color: Black Fabric/Material: Aluminium Gun Make: Universal Illumination Type: Tritium Gun Type: Universal Last Chance: Yes Package Contents: Meprolight FABS - Flip Back Up Rifle Sights What firearm models does the manufacturer say Meprolight FABS - Flip Back Up Rifle Sights is compatible with? The manufacturer suggests that Meprolight FABS - Flip Back Up Rifle Sights is compatible with UniversalMeprolight 405100: FABS - Flip Back Up Rifle Sights - Aluminium -Blank Rear-Green Front Black Body Black 405100