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Type 100 SMG

Type 100 Submachine Gun

smgNambu Arms Manufacturing · 1942–1945

OVERVIEW

Japanese SMG fielded in smaller numbers than Allied or German counterparts.

HISTORIAN'S COMMENTARY

Before the Storm

Introduced between 1942 and 1945, Type 100 SMG was built by Nambu Arms Manufacturing for Japan forces as a smg for total war armies.

In the Field

Chambered in 8x22mm Nambu and operating by blowback, open bolt, it offered an effective reach of about 150 meters. Crews could sustain roughly 450 rounds per minute in trained hands, carried in a 3.8 kg frame with a 30-round magazine.

Historian's Note

In practice it thrived in alleys, trenches, and ruined interiors where seconds decided survival. Historians usually remember this type as a pragmatic wartime tool: not glamorous, but consistently useful where battles were actually decided.

SPECIFICATIONS

Caliber8x22mm Nambu
ActionBlowback, open bolt
Rate of Fire450 rpm
Muzzle Velocity335 m/s
Effective Range150 m
Magazine30 rounds
Weight3.8 kg
Length890 mm

DEVELOPMENT

The Type 100 gave Japan a domestic SMG design, but production volume stayed modest compared with other major powers. Manufacturing priorities and doctrine limited widespread issue.

COMBAT HISTORY

It appeared in selected infantry and naval landing units, mainly in close-range Pacific engagements. Its battlefield footprint remained narrower than Japanese bolt-action rifle deployments.

NOTABLE USES

  • [01]Limited deployment in Pacific island defense fighting. - Type 100 SMG was used here in squad-level engagements where handling and immediate fire effect mattered.
  • [02]Seen with selected Imperial Japanese Army formations. - This theater exposed how ammunition load, reliability, and training shaped real battlefield outcomes.
  • [03]Used in close-range infantry actions where available. - Field reports from this context show why smg doctrine evolved during the war.

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