Precision Reflex Flip-Up Front Sight Gas Block .308 Armalite Elevation .875 Diameter Black. It fits directly over the barrel which eliminates the shadow that can come from flattop receivers. This gives you a clearer sight picture especially during particularly bright days letting you acquire and switch between targets easily. Plus as a flip-up sight you can choose to put it down if you want to look through a rifle scope or red dot sight increasing your field of view. Grab one today if you're looking for your next upgrade Specifications for Precision Reflex Flip-Up Front Sight Gas Block: Manufacturer: Precision Reflex Color: Black Condition: New Sight Mounting Orientation: Top Mounted Sight Position: Front Caliber: .308 Winchester Gun Model: Armalite AR-10 Gun Make: AR Platform Armalite Front Sight Color: Black Rear Sight Color: Front Sight Only Deployable: Yes Fabric/Material: T6 6061 Aluminum/ Cast Steel Front Blade Height: 2.694 Gun Type: Rifle Included Accessories: Standard Weather Resistance: Yes Attachment Type: Cross Bolts Features of Precision Reflex Flip-Up Front Sight Gas Block: Mounts directly onto the barrel Designed for .308 AR-platform weapons Flip-Up Sight Package Contents: Precision Reflex Flip-Up Front Sight Gas Block What firearm models does the manufacturer say Precision Reflex Flip-Up Front Sight Gas Block is compatible with? The manufacturer suggests that Precision Reflex Flip-Up Front Sight Gas Block is compatible with Armalite AR-10Precision Reflex 03-0023: Flip-Up Front Sight Gas Block .308 Armalite Elevation .875 Diameter Black