Mk4 Mod 0: Difference between revisions

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[[Category:Weapons]]
[[Category:Weapons of Vietnam]]
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! rowspan=2 | [[Ammo]]  
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|[[File:Flag_us_new.png|50px]]<br><strong>[[US]]</strong>|| [[File:MK4MOD0.png|500px]]<br><b>[[Mk4 Mod 0]]</b> || [[File:Weapon mk4mod0.svg|500px]] || [[File:Class_Assault.png|50px]] <b>[[Assault]]<br> || 20[[+1]] / 60
|[[File:Flag_us_new.png|50px]]<br><strong>[[US]]</strong>|| [[File:MK4MOD0.png|500px]]<br><b>[[Mk4 Mod 0]]</b> || [[File:Weapon mk4mod0.svg|500px]] || [[File:Class_Assault.png|50px]] <b>[[Assault]]<br> || 20[[+1]] / 80
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The Mk4 Mod0 was a variant of the [[M16]] rifle that was modified for use by Navy SEALs in Vietnam. The rifles had a corrosion resistant coating inside and out, in addition to O rings in the buffer tube and drain holes in the weapon to let water drain.
=HISTORY=
Navy SEALs used their own specialized variant of the M16A1 Assault Rifle, the Mk4 Mod 0.  Like the [[Stoner 63]], the M16 was designed by Eugene Stoner and, unlike the Stoner 63, became one of the most widely produced firearms in world history. After extensive testing and debate in the 1950s and early 1960s, the Air Force and Army officially adopted the M16 as a jungle warfare weapon. Using the [[5.56mm]] NATO round, the M16 was an impressive and innovative lightweight weapon capable of accurately delivering high velocity rounds at a relatively high rate of fire.


The Mk 4 Mod 0 was optimized for the amphibious and maritime operations of the SEALs. Most of the operating components of the weapon were coated in Kal-Gard and a small quarter inch hole was drilled in the buffer assembly to allow water drainage out of the weapon’s stock. This allowed the Mk 4 Mod 0 to survive depths of approximately 200 feet of water. The weapon also mounted a Mk 2 Mod blast suppressor as a standard component of the firearm. Based on the HEL (Human Engineering Lab) Mk4 suppressor, the Mk 2 Mod 0 suppressor, in addition to dampening the weapon’s noise, drained water faster than other suppressors while still allowing automatic and semi-automatic fire. These modifications armed SEALs with a powerful and specialized standard firearm in which to conduct their covert missions.
'''The Mk 4 Mod 0''' is a Navy SEAL–modified variant of the [[M16A1]] optimized for maritime and amphibious operations during the Vietnam War. It is best known for corrosion-resistant internal/external treatments and water-drain features intended to keep the rifle functional after submersion, along with SEAL-oriented accessories such as a blast suppressor.
<br>[https://hamptonroadsnavalmuseum.blogspot.com/2020/01/the-right-tools-for-job-seal-firearms.html SOURCE]
 
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==HISTORY==


Navy SEAL teams in Vietnam employed specialized small arms tailored to coastal, riverine, and amphibious missions. One such weapon was the **Mk 4 Mod 0**, a modified M16A1 pattern configured to better tolerate repeated exposure to saltwater, mud, and full submersion—conditions common to SEAL operations. The modifications described in period/historical writeups emphasize corrosion protection and practical “wet gun” reliability improvements, addressing problems that could otherwise stop a rifle after exiting the water.


<gallery mode="packed" heights="400px">
Accounts describing the Mk 4 Mod 0 note that key operating components were treated with corrosion-resistant coatings (including Kal-Gard) and that drainage provisions were added (such as a small hole in the buffer assembly and drain paths) to help clear water from the stock/receiver area. Sources also describe SEAL use of a blast suppressor (often referenced as a Mk 2 Mod 0 suppressor) intended to reduce signature and improve water drainage compared to other devices, while still permitting semi-automatic and automatic fire—supporting the SEAL need for a compact, reliable rifle during covert maritime missions.
File:Mk4 01.jpg
File:Ifro1jzyxmfa1.jpg
File:Mk4 02.jpg
</gallery>


===Sources===
* https://hamptonroadsnavalmuseum.blogspot.com/2020/01/the-right-tools-for-job-seal-firearms.html “The Right Tools for the Job: SEAL Firearms in Vietnam” | Hampton Roads Naval Museum (blog)


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  <div style="text-align:center; font-weight:bold;">Real-Life Photos</div>
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File:Mk4 01.jpg|Mk 4 Mod 0 (SEAL-modified M16A1).
File:Ifro1jzyxmfa1.jpg|.
File:Mk4 02.jpg|.
    </gallery>
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Latest revision as of 07:55, 24 February 2026

Factions Weapon Icon Classes Ammo

US
Mk4 Mod 0		 Assault
 20+1 / 80
Damage Base Headshot × Chest × Stomach × Leg × Arm × Bayonet Rifle Grenades Reload Speed
Partial Empty
35 ×2.5 = 87.5 ×1.2 = 42 ×1.15 = 40.25 ×0.8 = 28 ×0.75 = 26.25 NO NO 2.366 Seconds 3.166 Seconds
Designation Weapon Type Fire Modes Fire Rate Bullet Spread ° Range Modifier Muzzle Velocity Projectile weight Weight
Mk4 Mod 0 Suppressed
Assault Rifle		 Auto+Semi 750 RPM 7.02° & 1° ADS 0.950 960 m/s 12.3 g (189.81 gr) 3.89 kg (8.57 lbs)
Full name Caliber Place of Origin Date Manufacturer Barrel Length Total Length Weapon Script Name
FN 5.56mm USA 1967? Colt 20 in (508 mm)
+Suppressor		 in ( mm) weapon_mk4mod0


The Mk 4 Mod 0 is a Navy SEAL–modified variant of the M16A1 optimized for maritime and amphibious operations during the Vietnam War. It is best known for corrosion-resistant internal/external treatments and water-drain features intended to keep the rifle functional after submersion, along with SEAL-oriented accessories such as a blast suppressor.

HISTORY

Navy SEAL teams in Vietnam employed specialized small arms tailored to coastal, riverine, and amphibious missions. One such weapon was the **Mk 4 Mod 0**, a modified M16A1 pattern configured to better tolerate repeated exposure to saltwater, mud, and full submersion—conditions common to SEAL operations. The modifications described in period/historical writeups emphasize corrosion protection and practical “wet gun” reliability improvements, addressing problems that could otherwise stop a rifle after exiting the water.

Accounts describing the Mk 4 Mod 0 note that key operating components were treated with corrosion-resistant coatings (including Kal-Gard) and that drainage provisions were added (such as a small hole in the buffer assembly and drain paths) to help clear water from the stock/receiver area. Sources also describe SEAL use of a blast suppressor (often referenced as a Mk 2 Mod 0 suppressor) intended to reduce signature and improve water drainage compared to other devices, while still permitting semi-automatic and automatic fire—supporting the SEAL need for a compact, reliable rifle during covert maritime missions.

Sources

Real-Life Photos
  • Mk 4 Mod 0 (SEAL-modified M16A1).
    Mk 4 Mod 0 (SEAL-modified M16A1).
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    .
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    .
Videos
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