Dual HDM: Difference between revisions

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[[Category:Weapons]]
[[Category:Weapons of Vietnam]]
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! rowspan=2 | [[Ammo]]  
! rowspan=2 | [[Ammo]]  
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|[[File:Flag_us_new.png|50px]]<br><strong>[[US]]</strong>|| [[File:Dual HDM.png|250px]]<br><b>[[Dual HDM]]</b> ||  [[File:Weapon dual_hdm.svg|250px]]||[[Gun Game]] || 20 / 40
|[[File:Flag_us_new.png|50px]]<br><strong>[[US]]</strong>|| [[File:Dual HDM.png|512px]]<br><b>[[Dual HDM]]</b> ||  [[File:Weapon dual_hdm.svg|512px]]|| [[Special Loadout]]<br>[[Zombies]]|| 20[[+2]] / 60
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! rowspan=2 | Leg ×
! rowspan=2 | Leg ×
! rowspan=2 | Arm ×
! rowspan=2 | Arm ×
! rowspan=2 | [[Bayonet]] 
! colspan=2 | Reload Speed
! rowspan=2 | [[Rifle Grenades]] 
|-
|-
|30||×2.6 = 78||×1.7 = 51||×1.6 = 48||×1.1 = 33||×1.05 = 31.5||NO||NO
! Partial!! Empty
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|30||×2.6 = 78||×1.7 = 51||×1.6 = 48||×1.1 = 33||×1.05 = 31.5||3.966 Seconds||5.4 Seconds
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! rolspan=2 | [[Weight]]
! rolspan=2 | [[Weight]]
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|[[HDM]]||[[Pistol]]||Semi||50 RPM||8.5° & 4.75° [[ADS]]||0.72||329 m/s||2.7 g (41.6 gr)||3.3 kg (7.28 lbs)   
|[[HDM]]||[[Suppressed]]<br>[[Dual Pistols]]||Semi||50 RPM||8.5° & 4.75° [[ADS]]||0.72||329 m/s||2.7 g (41.6 gr)||2.6 kg (5.73 lbs)   
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! rowspan=2 | [[Place of Origin]]
! rowspan=2 | [[Date]]
! rowspan=2 | [[Date]]
! rowspan=2 | [[Armory]]   
! rowspan=2 | [[Manufacturer]]   
! rowspan=2 | Barrel Length
! rowspan=2 | Barrel Length
! rowspan=2 | Total Length
! rowspan=2 | Total Length
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The High Standard HDM is an American semi-automatic pistol equipped with an integral silencer. Based on the High Standard H-D pistol, it was adopted by the Office of Strategic Services (OSS) during World War II. Because of legal concerns during wartime, full-metal-jacketed .22 LR rounds were developed for this pistol.
The High Standard HDM is an American integrally suppressed semi-automatic pistol chambered in [[.22 LR]]. Based on High Standard’s H-D series target pistol, it was configured for clandestine use where minimal report and flash were critical. The HDM is best known for its long, fixed suppressor tube and its association with U.S. intelligence and special operations from World War II through the Vietnam era.
=HISTORY=
==HISTORY==
William J. Donovan demonstrated the pistol to President Franklin D. Roosevelt inside the Oval Office. During World War II, the HDM was adopted for use by the OSS. It later was used by CIA agents and US special forces units in the Korean and Vietnam War and supposedly up to the Gulf War.
The integrally suppressed High Standard was developed during World War II for the Office of Strategic Services (OSS) as a purpose-built “silent” pistol for close-range clandestine work. The suppressor design is commonly credited to engineers working through Bell Telephone Laboratories/Western Electric programs and was incorporated into High Standard pistols produced under wartime contract, creating the USA Model H-D MS/HDM pattern. Its simple blowback action and .22 LR chambering made it well suited to suppression, trading raw power for discretion and controllable, accurate placement at short distances.
 
The High Standard HDM is a conventional blowback-operated semi-automatic pistol fitted with an integral silencer which decreases its report by more than 20 dB. This pistol design was originally delivered on January 20, 1944, and original contract models were blued with a parkerized (phosphate) finish on the silencer. Follow on models were completely Parkerized. Post World War II models produced for the CIA were also blued. The weapon has a frame-mounted safety lever on the left in a similar position to the M1911A1 and Browning Hi-Power. The front sight is a fixed blade with a square notch fixed rear sight.
 
This weapon uses a heel-mounted magazine release. The weapon is effective at short ranges when the low energy of the round fired is taken into account. The design is simple and typical of the period in which it was designed.


The HDM is still used by the Central Intelligence Agency, the United States Marine Corps with 10 HDMS in use with Force Recon, and the United States Army Special Forces. Formerly used by OSS agents and Lockheed U-2 pilots.
After World War II, suppressed High Standard pistols continued to appear in intelligence and special operations inventories, and they are frequently discussed in connection with covert and reconnaissance missions. During the [[Vietnam War]], MACV-SOG and other special operations elements are documented as favoring suppressed .22 pistols for quiet, close-range tasks—particularly in prisoner snatch and reconnaissance contexts where limiting noise could be the difference between disengaging cleanly or triggering a larger firefight. By the late Cold War, these pistols were increasingly supplemented by newer suppressed sidearms, but the HDM remained an iconic example of early integrally suppressed handgun design.


During the Vietnam War, the .22LR suppressed High Standard pistols were again used by both CIA operatives (including Air America pilots) and Special Forces members of the classified Studies and Observations Group, including the Navy SEALs and Army's Green Berets. The pistols were put to use during a variety of operations including long-range reconnaissance patrols, snatch missions, ambushes, and assassinations. They were one of a range of suppressed weapons deployed and found use assassinating enemy officers and Communist Chinese observers, during snatch raids to capture high-ranking prisoners and in shallow penetration raids into Laos and Cambodia. Perhaps the most high-value target killed by a High Standard pistol was a North Vietnamese People’s Minister of Mobilization, shot in a crowded Hanoi square — the operative who shot him escaped unheard and undetected.
===Sources===
 
* [https://royalarmouries.org/collection/object/object-283467 Royal Armouries — Rimfire self-loading silenced military pistol (Hi-Standard Model HD-MS), 1944 (OSS issue)]
During the war in Vietnam, the World War II-vintage pistols were joined by newly made pistols modified to use a new suppressor developed by Frankford Arsenal in 1967; however, these proved less efficient and more bulky than the original Bell Labs design. The suppressed High Standard HDM/S pistols remained in CIA and special force's inventories well into the 1990s and a number probably are still retained today.
* [https://smallarmsreview.com/the-high-standard-usa-hd-ms/ Small Arms Review — “The High Standard USA HD MS”]
<br>[https://en.wikipedia.org/wiki/High_Standard_HDM SOURCE]
* [https://www.americanrifleman.org/content/behind-enemy-lines-guns-of-vietnam-s-sog-warriors/ American Rifleman — “Behind Enemy Lines: Guns of Vietnam’s SOG Warriors”]
<br>[https://taskandpurpose.com/tech-tactics/history-cias-silent-pistol-choice/ SOURCE]
* [https://taskandpurpose.com/tech-tactics/history-cias-silent-pistol-choice/ Task & Purpose — “The History Of The CIA's Silent Pistol Of Choice”]
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<gallery mode="packed" heights="400px">
  <div style="text-align:center; font-weight:bold;">Real-Life Photos</div>
File:3413.jpg
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File:20161104 114716-1.jpg
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File:Hdm-close-up-in-use-920x504.png
File:3413.jpg|High Standard HDM (integrally suppressed .22 LR pistol).
File:HDMMM2.jpg
File:20161104 114716-1.jpg|HDM on display.
File:IMG 2136 (1).JPG
File:Hdm-close-up-in-use-920x504.png|Close-up of the HDM in use.
File:IMG 2138.jpg
File:HDMMM2.jpg|HDM profile view.
File:Screen-Shot-2022-07-12-at-8.21.34-AM.png
File:IMG 2136 (1).JPG|HDM and suppressor assembly detail.
File:Hdmmmmmm.jpg
File:IMG 2138.jpg|HDM display photo.
File:HS.jpg
File:Screen-Shot-2022-07-12-at-8.21.34-AM.png|HDM shown in a historical presentation.
File:Schematic high standard HD.jpg
File:Hdmmmmmm.jpg|HDM, close-up.
File:Suppressed-guns-of-the-vietnam-war.jpg
File:HS.jpg|High Standard suppressed pistol family photo.
</gallery>
File:Schematic high standard HD.jpg|Schematic/diagram of the High Standard H-D/HDM pattern.
 
File:Suppressed-guns-of-the-vietnam-war.jpg|Suppressed weapons associated with the Vietnam War era, including the High Standard pattern.
    </gallery>
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</div>


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Latest revision as of 01:45, 4 March 2026

Factions Weapon Icon Classes Ammo

US
Dual HDM		 Special Loadout
Zombies		 20+2 / 60
Damage Base Headshot × Chest × Stomach × Leg × Arm × Reload Speed
Partial Empty
30 ×2.6 = 78 ×1.7 = 51 ×1.6 = 48 ×1.1 = 33 ×1.05 = 31.5 3.966 Seconds 5.4 Seconds
Designation Weapon Type Fire Modes Fire Rate Bullet Spread ° Range Modifier Muzzle Velocity Projectile weight Weight
HDM Suppressed
Dual Pistols		 Semi 50 RPM 8.5° & 4.75° ADS 0.72 329 m/s 2.7 g (41.6 gr) 2.6 kg (5.73 lbs)
Full name Caliber Place of Origin Date Manufacturer Barrel Length Total Length Weapon Script Name
High Standard HDM .22LR USA 1942 High Standard Manufacturing Company 6.75 in (171 mm) 13.815 inches (351 mm) weapon_dual_hdm


The High Standard HDM is an American integrally suppressed semi-automatic pistol chambered in .22 LR. Based on High Standard’s H-D series target pistol, it was configured for clandestine use where minimal report and flash were critical. The HDM is best known for its long, fixed suppressor tube and its association with U.S. intelligence and special operations from World War II through the Vietnam era.

HISTORY

The integrally suppressed High Standard was developed during World War II for the Office of Strategic Services (OSS) as a purpose-built “silent” pistol for close-range clandestine work. The suppressor design is commonly credited to engineers working through Bell Telephone Laboratories/Western Electric programs and was incorporated into High Standard pistols produced under wartime contract, creating the USA Model H-D MS/HDM pattern. Its simple blowback action and .22 LR chambering made it well suited to suppression, trading raw power for discretion and controllable, accurate placement at short distances.

After World War II, suppressed High Standard pistols continued to appear in intelligence and special operations inventories, and they are frequently discussed in connection with covert and reconnaissance missions. During the Vietnam War, MACV-SOG and other special operations elements are documented as favoring suppressed .22 pistols for quiet, close-range tasks—particularly in prisoner snatch and reconnaissance contexts where limiting noise could be the difference between disengaging cleanly or triggering a larger firefight. By the late Cold War, these pistols were increasingly supplemented by newer suppressed sidearms, but the HDM remained an iconic example of early integrally suppressed handgun design.

Sources

Real-Life Photos
  • High Standard HDM (integrally suppressed .22 LR pistol).
    High Standard HDM (integrally suppressed .22 LR pistol).
  • HDM on display.
    HDM on display.
  • Close-up of the HDM in use.
    Close-up of the HDM in use.
  • HDM profile view.
    HDM profile view.
  • HDM and suppressor assembly detail.
    HDM and suppressor assembly detail.
  • HDM display photo.
    HDM display photo.
  • HDM shown in a historical presentation.
    HDM shown in a historical presentation.
  • HDM, close-up.
    HDM, close-up.
  • High Standard suppressed pistol family photo.
    High Standard suppressed pistol family photo.
  • Schematic/diagram of the High Standard H-D/HDM pattern.
    Schematic/diagram of the High Standard H-D/HDM pattern.
  • Suppressed weapons associated with the Vietnam War era, including the High Standard pattern.
    Suppressed weapons associated with the Vietnam War era, including the High Standard pattern.
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