Does anyone here at FR know how to zero the front site on an Armalite AR=180?
The combination front sight post/gas block/upper sling swivel mount is mounted on the barrel held in position by the circumferential clamping force exerted by two screws that pass through the bottom of the band that goes around the barrel. This mounting method allows shooters to mechanically zero the front sight by loosening the mounting screws and physically rotating the front sight post around the axis of the barrel. We must admit to some misgivings about the reliability of this mounting method, but according to ArmaLite, the forces exerted by this method are immense, and it is extremely unlikely that the front sight will ever be move unintentionally. Put another way, any force strong enough to rotate the front sight is likely to be strong enough to destroy the barrel and handguards. The front sight post is adjustable for elevation, and can be rotated using the tip of a 5.56mm cartridge.