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|artist = {{artist name|海猫络合物}}, ??? and (Original Artist);<br/>{{artist name|陆银}} (One Who Shows the Way);<br/>{{artist name|STAR影法师}}(One-Eyed Rabbit Knight);<br/>{{artist name|暖森}} (Blazing Sun on the Ruins)

| weaponinfo = The M16 rifle, officially designated as the 'Rifle, Caliber 5.56 mm, M16', is the US military adaptation version of the Armalite AR-15 rifle. It is an air-cooled, gas-operated, Colt model name for M16 magazine-fed assault rifle was model 604. In 1964with a rotating bolt, M16 entered American military service and utilizes the following year was deployed for jungle warfare operations during the Vietnam War. Soon enough several problems were found with the rifle, the feedbacks direct-impingement system from the US soldiers pushed further development on the Eugene Stoner's AR-15 rifle. An initial experimental XM16E1 (Colt 's model 603) was deployed name for testing. After another round of live actions and feedbacks, the design on the final production model M16A1 M16 rifle was finalised in 1967. By the event Tet offensive carried out by Communist factions of Vietnam in 1968, XM16E1 and M16A1 were more widely deployed among US forces. In 1969 M16A1 replaced the M14 rifle to become the U.S. military's standard service rifleColt Model 603'.

The M16 During the early years of the Vietnam War, US troops were outfitted with the M14 battle rifle was also , chambering the first instance of 7.223 (562x51mm NATO cartridge.56mm) calibre Reports from in the field indicated several problems with the M14, with the most often-cited complaints being that the rifle and its ammo were too heavy, and that the gun was nigh uncontrollable in full auto thanks to its powerful cartridge. Calls for a new infantry rifle chambering an intermediate rifle cartridge deployed by NATO nations began to grow. In 1958, the US Army ran experiments with small squads in military offensescombat situations using the current M14, designed especially for the Armalite AR-15 rifle, and a third rifle designed by the Winchester Repeating Arms Company. The resulting study recommended adopting a lightweight infantry rifle like the AR-15. In response to this study, the Army elected to instead ramp up production of the M14.223 Remington cartridge developed since 1957However, would accompany the newly adopted M16 rifle into AR-15 had gotten the attention of the oversea conflictUS Air Force. This munition would be fired from a 20 inch barrel with a 1:12 twist rateAfter conducting its own test of the AR-15, from the M16s rifles used in VietnamUS Air Force decided to adopt the rifle as standard issue, and ordered 8,500 AR-15s.

M16A1 rifle classifies as a 5Extensive tests were conducted on the AR-15 in 1962 and 1963.56mm calibreWhile most evaluators praised the weapon's light weight, air-cooledreliability, gas-operated, magazine-fed assault rifleand effect on target, officials from the US Army Material Command cited issues with a rotating bolt. The rifle uses the direct-impingement from Eugene Stonergun's long range accuracy and lack of stopping power out at far ranges. Despite these complaints, the US Special Forces would be given permission to adopt the AR-15 rifleas standard issue in 1963. Several improvements were made from With so many within the original model 604 rifles, such as Armed Forces speaking positively about the redesigned bolt carrier, the introduction of a forwardAR-assist15, a new bird-cage style flash suppressor. Other ergonomic features were also added, such as an investigation was opened into why the slightly larger hollowed out fiberglass buttstock for cleaning kits, grooving ribs on weapon had been rejected by the receiver preventing magazine release being accidentally pressed and covering newly designed 'take-down screw' spring mechanismsArmy. The most important change was investigation found that the Army had rigged the chrome plated bore as well as bolt carrierprevious tests, after changing out the bore assembly selecting tests that would favor the rifle's malfunction rate declined M14 and the early problems experienced by M16 subsided, improving the overall performance of the rifle in tropical environmentschoosing match grade M14s to compete against factory stock AR-15s.

Other features on In January of 1963, then Secretary of Defense Robert McNamara personally ordered a halt to the rifle includes the rear aperture fixed on the carrying handleproduction of M14 rifles, can be flipped and adjusted between two sizes, front iron sight is fixed on the post above the barrel and in front after receiving reports that production was incapable of meeting demand. At the triangular hand guardtime, mounting of optics would have to be directly attached to the carrying handle. Selective fire handle can be found on AR-15 was the left side only rifle that could fulfill a requirement of a "universal" infantry weapon. McNamara ordered the receiverAR-15's adoption, toggles between semi and fully automatic fires. M16A1 rifle was widely deployed despite receiving reports of several deficiencies with the 20-round capacity aluminium box magazinedesign, however most notably the lack of a 30chrome-round capacity magazine were also developed and deployed in limited numbers by the final stage of Vietnam conflictplated chamber. At this point, eventually US military would standardise the 30-round capacity magazines for all servicing M16 rifles Army finally relented and make it into the classification recommended adoption of NATO STANAG magazine. The 40mm M203 grenade launcher introduced in 1969 was also designed to be permanently fixed under the triangular hand guard unitAR-15.

Eventually A1 models would retire from After undergoing some modifications, the AR-15 was adopted as the role of 'Rifle, Caliber 5.56 mm, M16'. In 1964, the standard M16 formally entered American military service rifle, M16A1 and the following year was replaced by deployed to troops in Vietnam. Almost immediately, reports began to surface of issues with the M16A2 model by 1980rifle in the field. Retired surplus units would be sold Despite all the modifications made prior to both domestic firearm enthusiasts market adoption, the M16 still did not feature a chrome-plated chamber, which resulted in issues with corrosion and foreign exportsstuck casings. The ammunition being provided with the M16 featured a new high-performance propellant, which had the side effect of producing more powder fouling. Many other nations would also use M16A1 This might not have been as much of an issue if Colt had bothered to ship the rifles with cleaning kits (Colt had marketed the M16 as their standard service a 'self-cleaning rifle', a claim with no basis in reality). This led to the M16 gaining a reputation among soldiers as a jam machine and a plastic toy.

In early 1967, a number of improvements were made to the M16 to address these issues, including finally switching to a chrome-plated chamber. The modified version of the M16 would be designated as the 'M16A1'. In addition to the modified rifle, cleaning kits and instructions on servicing the rifle were issued to troops, and a new powder was introduced that reduced carbon fouling. Following these changes, the number of reliability problems greatly diminished and the M16A1 rifle finally achieved widespread acceptance by U.S. troops in Vietnam. By 1969, the M16A1 had officially replaced the M14 as the standard infantry rifle of the US Army.  One of the most distinctive design features of the M16A1 is the large carry handle located on the top of the rifle. In the earlier AR-10, this carry handle was designed to protect the charging handle, however the charging handle was moved to the rear of the receiver on the M16. This large carry handle does make it difficult to put a scope onto the rifle, however. Modern versions of the M16 feature detachable carry handles and full-length Picatinny rails to allow easier mounting of optics. Other notable features of the A1 variant include the triangular black polymer handguard and 'bird cage' style flash hider. The magazines provided with the M16 were made of stamped aluminum, and were meant to be a lightweight, disposable item. Originally offered with 20 round magazines, the Army would later switch to larger, curved 30 round magazines. The M16 magazine became the basis of the NATO STANAG pattern magazine, which is used in numerous weapon systems around the world. Eventually, M16A1 models would be retired from standard infantry service, and were replaced by the newer M16A2 variant by 1980. Retired surplus units would be sold to domestic firearm enthusiasts and exported to foreign markets. Many other nations would go on to use M16A1 rifles as their standard service rifle. Currently, the M16 is in use by 15 NATO countries and more than 80 countries worldwide. Together, numerous companies in the United States, Canada, and China have produced more than 8,000,000 rifles of all variants. Despite its early reputation as a cheap plastic toy, the M16A1 has become a mainstay of US Military operations, and one of the most ubiquitous firearms in history. | design=

M16A1 is designed by the same artist as most of the AR Squadron, UmiNeko (海猫络合物), who . UmiNeko is also illustrated responsible for illustrating {{doll name|M4A1|AR|4}},{{doll name|M4 SOPMOD II|AR|4}} and {{doll name|RO635|SMG|5}}. M16's unique side bang colour is orange. M16 is depicted as the oldest out of all the AR team members, with her deeper and more mature voice, the way she looks out for her younger sisters, and the way she acts.

As a core character , a certain degree of lore and character settings were put into her designs, which the artist UmiNeko shared on in the official artbook of Girls ' Frontline:

''A siscon. In tight light of the period when the original design was completed and saw use, I found suitably down-to-earth (or perhaps drab) elements and put them together.''

''As for what's in the box, it contains several accessories she can choose from.''<ref name="artbook">{{cite |ab1|188-190}}</ref>

|costume1 = ???One Who Shows the Way<!-- |costume2 = ??? One-->Eyed Rabbit Knight|costume3 = Blazing Sun on the Ruins

File:M16A1 costume1.png|"???One Who Shows the Way" Full artworkFile:M16A1_costume1 D.png|"???One Who Shows the Way" Full damaged artwork<!File:M16A1 costume2.png|"One-Eyed Rabbit Knight" Full artworkFile:M16A1_costume2 D.png|"One- Eyed Rabbit Knight" Full damaged artworkFile:M16A1 costume2costume3.png|"???Blazing Sun on the Ruins" Full artwork --><!-- File:M16A1_costume2 M16A1_costume3 D.png|"???Blazing Sun on the Ruins" Full damaged artwork -->

*Her eyepatch and headset are likely a reference to Naked Snake, the main protagonist from the acclaimed Metal Gear Solid 3 game of , a title in the Metal Gear franchiseof tactical stealth action games.**Both the official manga and the mobile game have M16 shouldering her weapon on her right side and aiming down her sights , despite having an eyepatch over her right eye. This is likely another reference to Naked Snake , who often shoots while aiming down the sights with his eyepatch. The same could be said about her in-game Chibi-sprites chibi sprite which also shoulders the gun on her right side despite having her right eye covered by her eye-patch.*The [[Girls' Frontline: Doll's Song|official manga ]] of Girls' Frontline depicts M16 as being ambidextrous.

*M16A1 having two 'Doll' equipment slots means she is the only AR able to equip both an exo-skeleton and an armor plate at the same time, as you cannot normally equip the two of the same series of equipment at the same time.