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M16A1 Rifle, NSN 1005-00-073-9421, LIN R94977.  

In 1967 the M16A1 was adopted by the US Army, and it became the Army's standard issue rifle, with some 3,690,000 manufactured.   The weapon, chambered for 5.56x45mm NATO caliber, was a mainstay of the U.S. military for two decades, until it was replaced by the M16A2 starting in 1983.

The M16A1 featured a positive forward assist to help close the bolt when dirty, a chromium plated chamber and bore to resist corrosion, and an improved gas system with a new bolt buffer designed to reduce the rate of fire on full auto. These improvements, together with a new field cleaning kit and better maintenance instruction, helped to alleviate some of the original M16's reliability problems.

The major difference between the M16A1 and M16A2 is the fact that the M16A1 could operate in full-automatic mode, emptying an entire 30-round magazine in just a few seconds; whereas the M16A2 is restricted to 3-round bursts, a feature which preserves ammunition and improves accuracy. is researching the BII / COEI listing and component hand receipt for this item, and will post these documents when available.

Video:  TOP 10 Combat Rifles of All Time - M16 (No.2)

Accessories  (While it is physically possible to install these accessories on the M16A1, it is not routinely done, due to the M16A1's old age and the fact that the M16A2 replaced it in most Army units many years ago):

ACOG Scope (Multiple NSN)

M4 Triple Mag Pouch

M4 Staggered Mag Pouch

CQD Sling (NSN# 8415-01-504-3087)


Major End Items
NSN Description
1010-00-179-6447 M203, 40mm Grenade Launcher
5855-01-398-4315 PAQ-4 infrared laser designator
5855-01-447-8992 PEQ-2 infrared spotlight / laser designator
1240-01-492-5264 EOTech 1x Holographic-Diffraction Optical Reflex Sight
5855-01-432-0524 PVS-14, Monocular NVG (Can be mounted on M16 carrying handle using a rail adapter)
5860-01-471-2091 Laser Borelight System (LBS); used for field-zeroing mechanical and optical sights
RFI (Rapid Fielding Initiative) Accessories (Major End Items).  Fielded routinely to units through Force Modernization program, or through RFI bulk-issue during prep for deployment.
1005-01-452-6771 M5 Rail Adapter System (allows installation of accessories, such as a PEQ-2 or Surefire Tac-Light on front handguard)
1240-01-534-1114 and others ACOG (Advanced Combat Optical Gunsight) and other magnified and unmagnified optical sights, manufactured by Trijicon.
1240-01-411-1265 M68 CCO (Close Combat Optic) 1x "Red Dot" Optical Reflex Sight, manufactured by Aimpoint
RFI (Rapid Fielding Initiative) Accessories (Non Major End Items).  Fielded routinely to units through Force Modernization program, or through RFI bulk-issue during prep for deployment.
NSN Description
1005-01-541-1772 Rifle Bipod; Also called Forward Grip Bipod
1005-01-541-1771 Tactical Sling; Also called 3-Point Sling; (Click Here for more sling NSN's)
(TBP; LIN ZA905D) Enhanced sliding M4/M4A1 buttstock assembly; currently being mounted and used on M16-series rifle in large numbers because of the need to maneuver the weapon inside confined spaces (HMMWV interiors, for instance).  However, Ground Precautionary Messages state that this is "not authorized and can result in injury or equipment damage."
Other Accessories, Non Major End Items
NSN Description
Various SureFire Tactical Flashlight
4020-01-493-8337 Tactical Sling (not the RFI version), made by Blackhawk! and distributed through the Army supply system.  Carries weapon across chest, muzzle oriented downward, "at the ready"; (Click Here for more sling NSN's)
1005-01-520-5992 / 1005-99-126-9781 Heckler & Koch (HK) High-Reliability Steel Magazine
1005-01-541-2477 Multiple magazine holder; New AAL Item, may be included in RFI in the future
1005-01-541-2476 Forward rail bracket (also called CQB kit mini-rail); New AAL Item, may be included in RFI in the future
1005-00-921-5004 Standard 30-round magazine
1005-00-118-6192 M15A2 Blank Firing Adapter / Attachment (red in color, for M16 rifle only; yellow BFA, M23, NSN 1005-01-361-8208, is for the M4 carbine only)
5340-00-880-7666 Cap, Protective, Dust.  Keeps dust and dirt from entering the muzzle during normal operations, and can be left in place until the weapon is fired, but must be removed periodically to prevent rust build-up.
3rd Party Accessories -- COTS (Commercial, Off-the-Shelf)
Company Description
ARMS, Inc. ARMS #2 Rail adapters for M16A1/A2, which attach to the (non-removable) carrying handle and allow the attachment of optical aiming devices

Related End Items ("Also See...")

NSN Description
1005-01-231-0973 M4, Rifle, 5.56mm
1005-01-382-0953 M4A1, Rifle, 5.56mm (Rare, full-automatic version of M4)
1005-01-128-9936 M16A2, Rifle, 5.56mm (Most widely-used M16 variant)
1005-01-367-5112 M16A3, Rifle, 5.56mm (Rare, full-automatic version of M16A2)
1005-01-383-2872 M16A4, Rifle, 5.56mm (Similar to M16A2, but with detachable carrying handle and modular rail system)
1005-00-903-0751 M134 Minigun ("Gatling Gun"), 7.62mm
1005-00-589-1271 M14, Rifle, 7.62mm
TBP Rifle, 5.56mm, HK416
1005-01-469-2133 Rifle, .50 Caliber, Sniper:  XM107 (Barrett Family)
1005-01-534-2841 XM110 Semi-Automatic Sniper System (SASS)
1005-01-240-2136 M24, Sniper Rifle, 7.62mm
1005-01-081-4582 M231, Submachine Gun, 5.56mm (Firing Port Weapon for Bradley)
1005-01-127-7510 M249, Machine Gun, 5.56mm, Belt and Magazine-Fed (Squad Automatic Weapon)
1005-01-118-2640 M9, Pistol, 9mm, Automatic, Beretta (Model 92F)
1005-00-017-9701 M7, Bayonet, Multi-Purpose (Older Model)
1005-01-227-1739 M9, Bayonet, Multi-Purpose (New Model, with saw blade and integral wire cutter)

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