Samson Top Mounted Fixed Front and Rear Sight Black FXF-FXR-SP PKG. Available with the sightlink fiber optic front sight post. Accepts all aftermarket front sight post replacements with Mil-spec dimensions. It is not intended for lower height gas block rails. The durable construction and solid mounting system guarantees you to stay on zero Specifications for Samson Top Mounted Fixed Iron Sight: Manufacturer: Samson Color: Black Additional Features: M4 Co-Witness Condition: New Sight Mounting Orientation: Top Mounted Sight Position: Front and Rear Gun Model: AR-15 Gun Make: AR Platform Front Sight Color: Black Rear Sight Color: Black Deployable: No Fabric/Material: Aluminum Front Material: T-6061 Aluminum Illumination Type: Non-Illuminated Gun Type: Rifle Included Accessories: Standard Illumination Color: None Hand: Ambidextrous Mount Type: Picatinny Attachment Type: Picatinny Features Of Samson Top Mounted Fixed Iron Sight Attaches to any 1913 Picatinny rail Perfect (M4) Co-witness height Stainless steel clamp Precision laser engraving Package Contents: Samson Fixed HK Front/SP Rear Sight Set What firearm models does the manufacturer say Samson Top Mounted Fixed Iron Sight is compatible with? The manufacturer says that Samson Top Mounted Fixed Iron Sight is compatible with AR-15Samson FXF-FXR-SP PKG: Top Mounted Fixed Front and Rear Sight Black