The M4 is essentially a shortened version of the M16A2 service rifle currently issued to U.S. military service members. This weapon has all the attributes of the gas-operated, air-cooled M16A2 ,and fires a 5.56 mm round. The weapon features adjustable front and rear sights. It also features a shortened barrel, and some models have a collapsible stock. The front sight post of the M4 can be adjusted for elevation purposes, or it can be removed for maintenance or replacement.
1. Unload the weapon completely. Remove the magazine. Pull the charging handle to the rear. Visually inspect the chamber to ensure that no live ammunition is present.
2. Point the muzzle in a safe direction. Locate the front sight detent pin adjacent to the front sight post.
3. Depress the detent pin with a pointed object such as a punch, cleaning rod, or a dummy round.
4. Turn the front sight post towards the "Up" arrow. Continue turning the post until it is completely unscrewed.
5. Pull the front sight post off of the weapon.
Items you will need
- Pointed object (cleaning rod, punch or dummy round)