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Marlin M2 Hyde (Hyde-Inland / US SMG Cal 45 M2)

Submachine Gun [ 1943 ]

The promising M2 Hyde submachine gun was contracted out to Marlin during WW2 but doomed by its difficult manufacturing process.

Authored By: Staff Writer | Last Edited: 09/05/2023 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

Designed by George Hyde, the Hyde M2 (known formally as the "US Submachine Gun,. Caliber 45 M2" and alternative as the "Hyde-Inland") was an early-World War II Submachine Gun (SMG). The design appeared (as the "Hyde-Inland 1") at a time when the American war machine was ramping up its production and need was outpacing supplies. One such requirement was for an effective SMG design for short-to-medium ranges, a requirement ultimately fulfilled by the likes of the M1 Thompson and the M3 'Grease Gun' offerings found elsewhere on this site.

Nevertheless, the M2 Hyde was a 9.2lb automatic weapon of 32" length with a 12-inch-long barrel assembly while chambered in the powerful .45 ACP pistol cartridge. Internally, it operated from a blowback method of operation and offered 570 rounds-per-minute firing with a muzzle velocity of 960 feet-per-second from a 20- or 30-round detachable magazine (the same as featured in the M1 Thompson series). The stock included the shoulder support, body, forend, and pistol grip while the usual metal components were inlaid. The magazine feed was ahead of the trigger unit in typical fashion and a pair of sling loops were added to the left side of the forend and the shoulder stock. Iron sights were positioned at the rear of the receiver and over the muzzle. The receiver incorporated steel forging and took on the basic shape of a tube.

In testing, the M2 proved a robust and reliable, well-made weapon - certainly suitable for the task at hand - and in some cases even better than the classic M1 Thompson it was destined to compete against. It fired well and was accurate in the right hands to make a strong case for itself as a premiere wartime design.

The M2 contract for 164,450 guns was eventually initiated in the middle of 1942 and the task fell to gunmaker Marlin Firearms who proceeded to manufacture the much-needed SMG en masse. However, as basic as the design functioned, its manufacturing process led to a lengthy phase in which units were not made in useful numbers until May of 1943 with the war in full swing. By this time, the cheap-to-make and easy-to-use M3 'Grease Gun' has made it into production and overtook the desire to keep the M2 Hyde going.

As such, only around 400 M2 Hyde SMGs were produced from the period spanning 1942-1943 and none saw combat service in the war.©MilitaryFactory.com
Note: The above text is EXCLUSIVE to the site www.MilitaryFactory.com. It is the product of many hours of research and work made possible with the help of contributors, veterans, insiders, and topic specialists. If you happen upon this text anywhere else on the internet or in print, please let us know at MilitaryFactory AT gmail DOT com so that we may take appropriate action against the offender / offending site and continue to protect this original work.


Service Year

United States national flag graphic
United States


Submachine Gun

Untied States
(OPERATORS list includes past, present, and future operators when applicable)

Overall Length
813 mm
32.01 in
Barrel Length
12 mm
0.47 in
Empty Wgt
9.24 lb
4.19 kg

Iron Front and Rear.



Blowback Operation
Gas pressure from the rearward movement of the ignited cartridge case provides the needed bolt movement, ejecting the spent case and stripping a fresh case from the magazine.
(Material presented above is for historical and entertainment value and should not be construed as usable for hardware restoration, maintenance, or general operation - always consult official manufacturer sources for such information)


,45 ACP

Rounds / Feed

20- or 30-round detachable box magazine.
Cartridge relative size chart
*May not represent an exhuastive list; calibers are model-specific dependent, always consult official manufacturer sources.
**Graphics not to actual size; not all cartridges may be represented visually; graphics intended for general reference only.
Muzzle Velocity
960 ft/sec
(293 m/sec)

M2 Hyde - Base Series Name.
US Submachine Gun, Caliber 45 M2 - Formal American military designation.
Hyde-Inland - Alternative Name.
Hyde-Inland 1 - Initial prototype form.
Hyde-Inland 2 - Revised, improved prototype form.

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Image of the Marlin M2 Hyde (Hyde-Inland / US SMG Cal 45 M2)

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