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Heckler & Koch HK MP5SD Suppressed Submachine Gun (1974)

Authored By Staff Writer | Last Updated: 6/22/2014

The HK MP5SD is the silenced version of the HK MP5 submachine gun series - SD3 shown above.

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The excellence of the original Heckler & Koch HK MP5 series pushed the need for a dedicated suppressed form to be used by special operatives all over the world. This eventually became the MP5SD line of submachine guns appearing in 1974 which incorporated an integral suppressor assembly over the barrel, contouring rather cleanly into the receiver shape. Sub-variants allowed for various stocks (or lack thereof) to be utilized and all other MP5 functions were retained. The MPSD designation was formed from the German "Maschinen Pistole 5, Schalldampfer". Like the MP5 before it, the MP5SD series fired the widely-accepted 9x19mm Parabellum pistol cartridge from a 15- or 30-round detachable box magazine.

The principle feature of the MPSD series is its large aluminum suppressor assembly added to the front of the weapon which is coupled to base supersonic 9mm cartridges. Within this assembly is a shortened barrel that has been perforated with some 30 openings to allow for the controlled escaping of gasses as the weapon cycles through its action. The suppressor therefore shrouds the perforated barrel assembly and is designed with a two-stage, two-chamber process. The initial chamber (the one closest to the receiver) surrounds the barrel in an expected fashion and it is this chamber that initially collects the escaping propellant gasses, controlling the effects of the escaping bullet by reducing its pressure and retarding its acceleration. The second chamber (ahead of the muzzle) then takes these gasses and nullifies their effects even further by increasing gas volume and reducing its temperature while allowing a slow escape. The end result is that the subsonic bullet exits the muzzle at a lowered, now-subsonic, velocity and thusly its audible signature is reduced. Due to the fact that the MP5SD does not make use of subsonic ammunition coupled with its suppressor, it is not a truly "silent" weapon in the accepted sense. A lightweight bolt assembly does figure into the device, however, and helps to lower the audible signature of the internal action.

As with other variants in the MP5 production line, the MP5SD series begat a small host of sub-variants based on the initial design. The MP5SD1 was the initial silenced offering and lacked a stock (an endplate fitted in its place) while utilizing the standard semi-/full-automatic fire selector. The MP5SD2 was fielded with a solid fixed stock and same trigger group as the MP5SD1. The MP5SD3 sported a collapsing stock but was otherwise the same as the SD1 and SD2 before it. The MP5SD4 lacked a stock but instituted a burst-fire function. The MP5SD5 was similar only given a full solid stock. The final SD model in the series became the MP5SD6, complete with a collapsing stock and three-round burst facility.

A specialized version of the MPSD3 was ordered by the United States Navy as the "MP5SD-N" and given a collapsing stock, "Navy trigger group" (visual bullet labels as opposed to the original "SEF" letter labeling), larger suppressor of stainless steel construction (by Knight's Armament Company) and a tritium-illuminated front post sight. This version (available with collapsing stock - MP5SD-N1 - and fixed solid stock - MP5SD-N2) has been used by Navy SEAL and SAS operatives.

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Specifications for the
Heckler & Koch HK MP5SD
Suppressed Submachine Gun


Country of Origin: Germany
Manufacturer: Heckler & Koch GmbH - Germany
Initial Year of Service: 1974


Overall Length: 790mm (31.10in)
Barrel Length: 146.00mm (5.75in)
Weight (Empty): 6.61lbs (3.00kg)


Caliber: 9x19mm Parabellum
Action: Roller-Locked; Delayed Blowback; Select-Fire
Feed: 15- or 30-Round Detachable Box Magazine
Muzzle Velocity: 935ft/sec (285m/sec)
Rate-of-Fire: 700 rounds per minute
Range: 600ft (183m; 200yds)
Sights: Iron front and rear; optional optics


Variants:
MP5SD1 - Sans stock; semi-/auto-fire trigger group


MP5SD2 - Fixed solid stock; semi-/auto-fire trigger group.

MP5SD3 - Collapsible stock; semi-/auto-fire trigger group.

MP5SD4 - Sans stock; 3-round burst function

MP5SD5 - Fixed solid stock - 3-round burst function

MP5SD6 - Collapsible stock; 3-round burst function

MP5SD-N1 - US Navy variant; collapsing stock; Navy trigger group; stainless steel suppressor.

MP5SD-N2 - US Navy variant; fixed solid stock; Navy trigger group; stainless steel suppressor.


Operators:
Germany; West Germany; United Kingdom; United States