AR556

From Top to bottom: MK16A1, MK16A2, MK4A1, MK16A4 MWS

The *AR556* (Assault Rifle cal 5.56mm) is the Nevian equivalent of the AR-15 family of rifles. The Rifle platform developed as a suitable replacement for the M1 Lockram and the MN14. It is chambered at the 5.56x45mm SDC cartridge.

## Design

The AR556 lower is a trademark of Holt's Firearms Incorporated, as well as the upper receiver. The Innovative features of the AR556 was not only it's ability to accept endless amounts of customization, but it's abundance of standard and aftermarket interchangeable componenets, such example is by converting a MK4 carbine into a MK16A4 by changing the MK4 upper into the latter, which that upper bundle obviously delivered more accuracy, muzzle velocity, precision and lethality that makes it beneficial for people who want to convert their AR556s on the spot.

Rifling on AR556s are compatible with multiple varieties, for example, many AR556s feature a 1:7 twist rate. This means the rifling makes one complete rotation over seven inches of barrel length. The smaller the second number in the ratio, the faster the bullet spins. A larger second number indicates a slower rate of spin

## Variants

### 5.56mm Variants

* **XM16**
* **MK16**
* **MK16A1**
* **MK16A2**
* MK16A2E3/MK16A3
* **MK16A4**
* XM166/MK166
* MK4A1
* MK5 Maverick
* MK16A5

### AR308 Variants

Non conversion or legitimate Conversion rifles are AR556 style rifles that are chambered for the larger 7.62x51mm SDC cartridge, or sometimes the widely claimed the most accurate round, the 6.5 Cyphercore. Most AR308 style rifles are Marksman rifles.

* XM308
* Holt Model 178
* MK-308 SPR
* MK-308 SPR Mod 0
* CYP-308
* CYP-308 Mod 1
* CYP-65 Forester
* CYP-70 Fallbearer

## Standard Interchangeable Parts

### Rear Sight

* Stock "Slick Side 07"
* A2 Adjustable
* A3/A4 STD-7 Detachable rear sight

### Rail

* Red Dot Sight
* M2 Reflex Sight
* XM21 Reflex Sight
* C6E Reflex Sight
* Serizawa J7
* RIATech Holographic
* Z9 Scout
* CTS Scope
* ACOG Scope
* RIA Accupoint 1-5x25
* Epzyane Bender 1-6x24

### Barrels

* ICT 22.5" 1/4
* Corvus 20" 1/4
* GOVT 20" 1/7
* GOVT 20" 1/9
* SPR FFB 18"
* CYP 17.5"
* STD 16"
* STD GOVT 15"
* GOVT 14.5"
* RIA 12.5"
* Commando 11.5"
* CQBR 10.5"
* Pistol 5.5"

### Buttstock/s

* C75 Fixed Stock
* C85 Marksman Fixed Stock
* RIA C87 Fixed Stock
* STD-785 RT Stock
* STD-885 MOD Stock
* CYPH8 Skeletonized Stock
* Tube protector (When Not Equipping stocks, this may be useful.)

## Standard and Aftermarket Parts

### Handguards

* Retro Toblerone
* GOVT Polymer
* M8 RAS
* M10 RAS
* RIA FLAS
* GOVT MK4
* FFB 9"
* FFB 10"
* FFB 12"
* FFB 15"

### Barrel devices

* Advanced Rifling
* Lightweight Suppressor
* Monolithic Suppressor
* Phantom Suppressor
* Muzzle Brake
* MK1 Duckbill
* MK2 Birdcage
* MK3 Tailgate

### Underbarrel

* MK203 Grenade Launcher
* MK320 Grenade Launcher
* Angled Foregrip
* Foregrip
* Rubberized Foregrip
* Heavy Duty Foregrip
* Surefire M900 Flashlight Grip
* M910 Flashlight

### Laser

* AN-PEQ2/A
* 1mw Laser
* 5mw Laser
* 10mw Laser

### Magazine

* STD 30 Round Magazine (Default)
* Quadstock Magazine
* Elongated Magazine
* Extended Mags
* Dual Mags
* 20-Round STD Magazine
* 50 Round Drum Magazine
* .458 SOCOM 10-Round Magazine

### Ammunition

* RIA-12 Tracer Rounds
* RIA-7 Inciendary Rounds
* RIA-4 Hollow Points
* M68 Inciendary Ammunition
* RIA-CYP Biotox Ammunition