Precision Reflex PRI G1 Flip Up Front Sight w/ .750 Crossbolt Black. Front post is constructed of T6 6061 hard coated black anodized aluminum. Front post uses a thumb wheel to adjustment front sight elevation. Sight weights 4.9 ounces. The center line of barrel to line of sight is 2.57in the cross bolts are #10-32 x 3/4in socket head cap screws. Specifications for Precision Reflex PRI G1 Flip Up Front Sight w/ .750 Crossbolt: Manufacturer: Precision Reflex Color: Black Sight Mounting Orientation: Top Mounted Sight Position: Front Gun Model: M4 AR-15 Gun Make: AR Platform Front Sight Color: Black Rear Sight Color: Front Sight Only Deployable: Yes Fabric/Material: T6 6061 Aluminum/ Cast Steel Front Blade Height: 2.575 in Gun Type: Rifle Included Accessories: Standard Weather Resistance: Yes Package Contents: Precision Reflex PRI G1 Flip Up Front Sight w/ .750 Crossbolt What firearm models does the manufacturer say Precision Reflex PRI G1 Flip Up Front Sight w/ .750 Crossbolt is compatible with? The manufacturer says that Precision Reflex PRI G1 Flip Up Front Sight w/ .750 Crossbolt is compatible with AR-15 M4Precision Reflex 05-0025-G1: PRI G1 Flip Up Front Sight w/ .750 Crossbolt Black