An integrally suppressed version of the G3 rifle for special forces. Features battle rifle damage characteristics with mild recoil, slow fire rate, and a smaller magazine than average.
–In-game description
MC51SD angled
Weapon Type Primary Weapon
Weapon Class Carbine
Rank Prerequisites Rank 86
Damage 46 → 25
Range 20 max → 121 min


Hip Accuracy


Sight Accuracy


Magazine Size 20, 21 with round in chamber
Ammo Reserve 120
Fire Modes Auto & Semi
Rate of Fire 540 RPM

TTK (Time to Kill) 0.11 s
Head & Body Multiplier
per bullet/pellet
Max (20 studs) Min (121 studs)
(x1.40) Head 64.4 35
(x1.10) Torso 50.6 27.5
(x1) Arms and Legs 46 25
Red color signifies a fatal hit.
Suppressed Stats
Suppressor/Bullet Attachment Suppressed Damage Suppressed Range
ARS Suppressor 46 -> 22.5 20 max -> 121 min
R2 Suppressor 43.7 -> 23.75 19 max -> 114.95 min
PBS-1 Suppressor 43.7 -> 23.75 19 max -> 114.95 min
PBS-4 Suppressor 43.7 -> 23.75 19 max -> 114.95 min
Suppressor 41.4 -> 25 18 max -> 121 min
Armor Piercing 46 -> 20.83333 0 max -> 121 min
Hollow Point 55.2 -> 30 20 max -> 121 min
Muzzle Velocity 1800 studs/s
Penetration Depth 1.0 studs
Suppression 0.4


Hipfire Camera Recovery Speed 18
Sight Camera Recovery Speed 19
Weapon Recovery Speed 15
Weapon Recoil Damping 0.9


Min Camera Kick (1.76, -0.49, -0.41)
Max Camera Kick (1.84, -0.09, 0.40)
Min Recoil Displacement (-0.25, 0.16, 6.32)
Max Recoil Displacement (0.24, 0.40, 11.35)
Min Recoil Rotation (0.16, 0.40, -0.25)
Max Recoil Rotation (0.32, -0.41, 0.24)
Hipfire Spread Factor 0.09
Hipfire Recovery Speed 8
Hipfire Spread Damping 0.90


Min Camera Kick (1.43, -0.33, -0.33)
Max Camera Kick (2.16, 0.56, 0.32)
Min Recoil Displacement (-0.09, 0.88, 8.96)
Weapon Shot Displacement (0.08, 1.12, 11.84)
Min Recoil Rotation (0.56, -0.17, -0.41)
Max Recoil Rotation (0.80, 0.16, 0.40)
Sight Magnification 2.1x


Reload Time 2.4 seconds
Empty Reload Time 3.1 seconds
Equip Speed 15
Aiming Speed 17
Crosshair Size 28
Crosshair Spread Rate 300
Crosshair Recover Rate 25


Weapon Walk Speed 14 stud/s
Aiming Walk Speed 9.7 stud/s
Ammo Type 7.62x51mm NATO
Round in Chamber One
Shot Suppression Range Active

List of Attachments

Optics Kills Required
C79 125 Kills
Comp Aimpoint 130 Kills
EOTech 552 85 Kills
EOTech XPS2 55 Kills
Kobra Sight 320 Kills
M145 185 Kills
PK-A 165 Kills
PKA-S 225 Kills
VCOG 6x Scope 455 Kills
Z-Point 10 Kills
TA33 ACOG 650 Kills
TA11 ACOG 1750 Kills
TA01 ACOG 2500 Kills

Underbarrel Kills Required
Angled Grip 115 Kills
Vertical Grip 45 Kills
Folding Grip 265 Kills
Stubby Grip 355 Kills
Laser 75 Kills

Barrel Kills Required
ARS Suppressor 150 Kills
Compensator 120 Kills
Muzzle Brake 175 Kills
R2 Suppressor 40 Kills
Flash Hider 100 Kills
PBS-4 Suppressor 245 Kills
PBS-1 Suppressor 205 Kills
Suppressor 30 Kills

Other Attachments Kills Required
Green Laser 110 Kills
Canted Delta Sight 405 Kills
Laser 20 Kills
Canted Iron Sight 310 Kills
Ballistics Tracker 1500 Kills
Hollow Point 2000 Kills
Armor Piercing 1000 Kills

The MC51SD is an American/British Integrally Suppressed Carbine variant of the G3. It is unlocked at rank 86, or it can be bought with credits.


The MC51 (Machine Carbine 51) was a modified version of the G3. It used many components from the MP5, such as the handguard and a modified upper receiver with longer charging slot to accept the 7.62 NATO bolt design. The design and conversion was made by Fleming, an American company, and therefore the nomenclature is in English.

In the late 1980s, the UK special forces were looking for a suppressed weapon more powerful than the Sterling and MP5SD. A British company, FR Ordnance International Ltd, contacted Fleming. Permission was granted to FR Ordinance to use the MC51 design, and they made an integrally suppressed version of the weapon. However, with a barrel that is only 230mm (9.1 inches) long, the MC51 and its variants were too short and light to be used as a compact platform for the 7.62 NATO cartridge. The weapon was unreliable as a result, and the ammunition was not designed for this type of weapon. The British went ahead and instead adopted the G3KA4 made by H&K, designated it as the L100A1, and did not replace the MP5SD.


General Information

The MC51SD is a slow and steady carbine. With a firerate firmly parked between the AG-3 and the G3 (its unsuppressed platform members), it serves as a middleground in the G3 family. With high minimum damage and relatively tame recoil, the MC51SD serves as an interesting, stealthy alternative to its family.

Usage & Tactics

For anyone used to the SCAR-H without attachments, the MC51SD will be a familiar (albeit slower paced) experience. While the MC51SD has recoil, it is not particularly bad: it bounces directly up, so a sight with a relatively open lower housing (such as the OKP-7) makes targeting enemies during recoil much easier. Its hipfire performance is middling at best, but within about 30 studs, this weapon is a serious threat to anyone blindly charging its wielder.

Should the MC51SD ever land a headshot in close quarters distances, it will be enough to allow any follow-up shot from the weapon, anywhere on the body, to kill the target. Even a bodyshot deals at least 50 damage up close, making the MC51SD surprisingly lethal. Otherwise, it is a three-shot kill (3SK) weapon.

The MC51SD's very slow damage drop-off rate it pays off, by having one of the closest maximum effective ranges of all carbines, at 121 studs. Even at range, however, it still takes 4 shots from the MC51SD to get a kill, making it play much like an assault rifle.

Of note is the MC51SD's heavily dampened sound. When it is quiet, this weapon is almost as difficult to place as a MAC10 using the Sionics Suppressor. If there happens to be any gunfire, the MC51SD will quickly fade into the background, becoming almost unnoticeable. This makes the MC51SD an extremely good weapon for stealthy players who can pick their targets, but need to be able to have some crowd control options. Consider this weapon an excellent choice for flankers with the ability to fight a large majority of weapons one-on-one in close quarters.


The MC51SD is a well rounded carbine with a battle rifle cartridge. Despite the integral suppressor's detriments of lower velocity and limited effective range, the MC51SD is a force to be reckoned with. However, its slow fire rate and 20 round magazine means that any misses will be punished and exploited by weapons with larger magazine capacity and higher fire rates.

Pros & Cons


  • Integral suppressor.
  • High damage—two-shot body shot up close.
  • Fast reload times.
  • Good handling characteristics.


  • Slow rate of fire.
  • Bouncy visual recoil, made worse when using sights which obstruct the lower screen.
  • Wide horizontal recoil.
  • Cannot equip barrel attachments.
  • Short maximum damage range.
  • High bullet drop, have to aim higher than the target from medium range.


  • In 4.14.0 update, the MC51SD has its own retractable stock, reducing vertical recoil, which you can unlock at 450 kills or buy with credits.
  • In addition to the original MC51 and MC51SD, the other variants include the MC51K and MC51T, a tactical version with a retractable stock and a limiter to a three-round burst.
  • The "MC51SD" was never an actual name or designation of the weapon. It was called so in popular culture due to the resemblance to the MP5 SD.
  • The MC51 in game used an extended MP5 SD handguard. The real life counterpart used the normal MP5 SD handguard.
  • The MC51 was discontinued due to the closure of the manufacturer. The MC51 can still be owned in the USA as it was initially a commercial firearms.
    • The MC51SD is virtually impossible to come across in private ownership because it was made only for the UKSF triad. By UK laws, it can only be used by the British military or be destroyed.


Primary Weapons

Assault Rifles

AK12 - AN-94 - AS VAL - SCAR-L - AUG A1 - M16A4 - G36
M16A3 - AUG A2 - FAMAS G2 - AK47 - AUG A3 - L85A2
HK416 - AK74 - AKM - AK103 - TAR-21 - M231 - G11K2

Personal Defense Weapons

MP5K - UMP45 - G36C - MP7 - MAC10 - P90 - MP5
Colt SMG 635 - L2A3 - MP5SD - MP10 - MP5/10 - Uzi - M3A1
AUG A3 Para - PPSh-41 - FAL Para Shorty - Kriss Vector
MP40 - X95 SMG - Tommy Gun

Light Machine Guns

Colt LMG - M60 - AUG HBAR - MG36 - RPK12 - L86 LSW - RPK

Sniper Rifles

Intervention - Remington 700 - Dragunov SVU - AWS - BFG 50
AWM - TRG-42 - Mosin Nagant - Dragunov SVDS - Hecate II
M107 - Steyr Scout - WA2000


M4A1 - G36K - M4 - L22 - SCAR PDW - AKU12 - Groza-1
AK12C - Honey Badger - SR-3M - Groza-4 - MC51SD
FAL 50.63 Para - 1858 Carbine - AK105 - Jury - KAC SRR
X95R - HK51B

Designated Marksman Rifles

MK11 - SKS - SL-8 - VSS Vintorez - MSG90 - Beowulf TCR

Battle Rifles

Beowulf ECR - SCAR-H - AK12BR - G3 - AG-3 - Henry 45-70
FAL 50.00


KSG-12 - Remington 870 - DBV12 - KS-23M - Saiga-12
Stevens DB - AA-12 - SPAS-12

Secondary Weapons Pistols

M9 - G17 - M1911 - Desert Eagle L5 - M45A1 - Five Seven
ZIP 22 - Desert Eagle XIX

Machine Pistols

G18 - M93R - TEC-9 - Micro Uzi - MP1911


MP412 REX - Mateba 6 - 1858 New Army - Redhawk 44
Judge - Executioner


Serbu Shotgun - SFG 50 - Sawed Off - Saiga-12U - Obrez

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