Marine Corps approved a similar change in October 2015. Army has largely replaced the M16 in combat units with the shorter and lighter M4 carbine, and the U.S. Total worldwide production of M16s has been approximately 8 million, making it the most-produced firearm of its 5.56 mm caliber. The M16 has also been widely adopted by other militaries around the world. It is equipped with a removable carrying handle and Picatinny rail for mounting optics and other ancillary devices. Adopted in 1998, the M16A4 is the fourth generation of the M16 series. The M16A2 fires the improved 5.56×45mm NATO (M855/SS109) cartridge and has a new adjustable rear sight, case deflector, heavy barrel, improved handguard, pistol grip and buttstock, as well as a semi-auto and three-round burst only fire selector. In 1983, the USMC adopted the M16A2 rifle and the U.S. The M16A1 improvements include a bolt-assist, chrome plated bore and a new 30-round magazine. In 1969, the M16A1 replaced theM14 rifle to become the U.S. In 1964, the M16 entered American military service and the following year was deployed for jungle warfare operations during the Vietnam War. The original M16 was a select-fire,5.56×45mm rifle with a 20-round magazine. Two time torquing (three times total) procedures pro vide for a better thread fit and prevents barrel nuts from becoming loose.ĭo not use the torque wrench for loosening.The M16 rifle, officially designated Rifle, Caliber 5.56 mm, M16, is a United States military adaptation of the Armalite AR-15 rifle. Loosen the vise and aline the front sight base in « vertical position (use a vertical line on the wall to check this) then tighten vise to hold the barrel assembly in that position. Make certain all three drive pins on combination wrench are engaged with barrel nut assembly. Torque is measured when both wrenches are used together. Using combination wrench and torque wrench, torque barrel nut assembly to 35 ft-lb. Apply molybdenum disulfide grease (item 11, app D) to the threads prior to installation.Įngage threads of barrel nut assembly with upper receiver assembly. Wipe upper receiver thread clean and ensure there are no burrs. Upper receiver assembly (6)Īline upper receiver assembly using barrel alinement pin and the slot in upper receiver assembly. Using barrel remover fixture, clamp barrel in vise. Position rifle barrel with aline-ment pin up.
Rifle barrel Barrel Assembly assembly (5) Snap retaining ring to barrel nut.Īpply molybdenum disulfide grease (item 11, app D) to threads of barrel n' ft assembly before installation.Ģ Upper Receiver and a. Install against slip ring spring using retaining ring pliers. Press in from both sides and insert slip ring spring into hand-guard slip ring. Handguard slip ring (2) Slide handguard slip ring over barrel nut. Slide barrel nut to the rear of barrel as far as possible.ī. 1 Barrel Nut Assembly and Rifle Barrel Assembly a.
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