View source for M16A1

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| colspan="2" |'''M16A1 Assault Rifle, 5.56x45mm'''
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{| class="wikitable" style="width: 100%; background-color:#CCE5FF;" cellpadding="10"
|'''National Origin'''
|[https://en.wikipedia.org/wiki/United_States United States]
|-
|'''Factions'''
|[[United States Army (US Army)]]
[[United States Marine Corps (USMC)]]
[[Australian Army (ANZAC)|Australian Army ]]
|-    
|'''Weapon Type'''
|Assault Rifle, Magazine-fed
|-   
|'''Roles'''
|[[Grunt (South Vietnam)]] (US Forces)
[[Pointman (South Vietnam)]] (ANZAC) (ARVN)

[[Radioman (South Vietnam)]] (US Forces)

[[Commander (South Vietnam)]] (US Forces)
|-    
|'''Inventory Slot'''
|Primary (Slot 1)
|-   
|'''Variants'''
|N/A
|-   
|'''Caliber'''
|5.56x45mm NATO
|-   
|}
|}
'''''“Introduced into wide service in 1968, Colt's M16 design became the standard in modern assault rifles”''''' 

''— in-game description''

The M16 family of rifles is often the standard-issue service rifle to United States soldiers, as well as many of its allies, ever since the Vietnam War. The variant used by South Vietnamese forces in ''Rising Storm 2: Vietnam'' is the M16A1, which is a select-fire, gas-operated rotating-bolt assault rifle chambered in 5.56 x 45 mm NATO, fed via 20-round detachable box magazines. 

However, since the M16A1 often faced reliability issues in relation to the feed system, soldiers frequently avoided loading the full 20 rounds into their magazines. To simulate this, M16A1 magazines in-game only contain 18 rounds.

===History===
----Developed as part of the US military's search for a firearm chambered in a cartridge ideally balanced between the hefty and unwieldy .30-06 and the lightweight but under-powered .30 Carbine, the M16 is the cutting-edge result of two decades of engineering and development.

In its initial stages, the attempt to consolidate the US military's arsenal after WW2 and come up with an elegant solution to fill the gap for a select-fire battle rifle saw the adoption of the M14, the successor to the M1 Garand. However, early reports from the Vietnam War suggested that the M14 was woefully outclassed by the AK-47, which had far better control in fully automatic fire, in turn translating to fire superiority over the Americans. The only other alternative select-fire weapon the Americans had was the updated M2 Carbine, but it was soon discovered that .30 Carbine was limited in versatility and under-powered.

Originally in 1956, to meet the military's requirements, ArmaLite had submitted the AR-10 prototype - a futuristic-looking aluminium and composite lightweight rifle chambered in the new 7.62x51mm NATO round. The military had adopted the M14 by this stage, but they were forced to consider a request for a 5.56 cartridge and rifle just a year later in 1957. This was ArmaLite's AR-15 - the precursor to the M16.

Following this, there was much controversy over the split between the M14 and the AR-15: whereas the latter was enthusiastically received by early Special Forces units trialing the weapons in Vietnam, many, including the Army, were reluctant to adopt two separate weapon platforms, insisting that the M14 was sufficient. Finally, the M14 gave way to the overwhelming evidence of effectiveness and the M16 was formally adopted for jungle warfare operations in 1964. Unfortunately, the early reputation of the M16 was quickly tarnished due to its poor reliability record in the harsh conditions of Vietnam. Because of its direct-impingement gas system, residue from fired ammunition would be returned to the receiver, causing a build up that negatively affected the weapon's performance. This caused the infamous 'failure to extract' (where fired cartridges remain lodged in the chamber) which unfortunately translated to significant casualties in combat, otherwise easily prevented. It was later found that a large part contributing to the malfunctions was the simple lack of cleaning (troops were instructed that the new rifle somehow was capable of cleaning itself and hence were not issued kits nor taught how to clean). Other factors critically included the powder of the cartridge, which left a lot more residue, as well as the inexplicable decision to remove the chrome plating for the bore which would have helped prevent corrosion, that the AR-15 had so strongly boasted.

To solve these problems, the XM16E1 was improved many times with upgrades such as a chrome-plate bore. The final XM16E1 design was standardised as the M16A1 in 1967 and emphatically removed next to all issues pertaining to reliability. Gradually, confidence was regained and the M16A1 became widely accepted. The M16A1 replaced the M14 as the US military's standard-issue rifle in 1969

===Weapon Specifications===
----'''M16A1'''
[[File:Us weap m16a1 rifle 20rd.png]]

''Rifle, Caliber 5.56 mm, M16.''
{| class="wikitable"
! colspan="2" |Ammunition
|-
|'''Ammo Type'''
|55gr M139 FMJ
|-
|'''Rounds Per Magazine'''
|18+1 Rounds
|-
|'''Magazines'''
|8 Magazines
|-
|'''Weight Per Magazine'''
|0.34 kg / 0.74 lbs
|-
! colspan="2" |Handling
|-
|'''Weight'''
|2.89 kg / 6.37 lbs
|-
|'''Features'''
|Attachable Bayonet
|-
|'''Firemodes'''
|Fully Automatic 
Semi-Automatic
|-
|'''Rate of Fire'''
|750 RPM
|-
|'''Recoil'''
|'''Vertical''': 175
'''Horizontal''': 40
|-
|'''Spread (MOA)'''
|1.5 MOA
|-
|'''Length'''
|1000 mm
|-
|'''Melee Reach'''
|1560 mm
|-
! colspan="2" |Damage
|-
|'''Instant-hit Damage'''
|95
|-
|'''Damage Value'''
|396
|-
|'''Energy Impulse'''
|176
|-
|'''Penetration Depth'''
|10
|-
|'''Ballistic Coefficient'''
|0.12
|-
|'''Velocity'''
|990 m/s
|}

===Trivia===
----

*The M16A1 was originally supposed to come with both 20-round and 30-round box magazine variants. The extended 30-round magazine was removed from the game shortly after the Closed Beta began, since 30-round magazines were historically not available until later in the war (circa 1971).

*Despite this, 30-rounders is still found within the game SDK as well as seen on early promotional material, such as the E3 2015 Announcement Trailer.
*The M16A1 in game is one produced in 1969 or 1970, due to having a front sight without the flashing removed, which was introduced in 1969, but still having the solid body stock that was replaced with one with a compartment for a cleaning kit in 1971.