Source: ATF P 5300.11 · Curios or Relics List · Jan 1972 – Apr 20253,573 entries · 4 sections
The C&R RegisterA finding aid to the ATF Curios or Relics List, for Type 03 collectors
C&R · IV · 144

Type 10 grenade discharger (knee mortar)

Section IV: still an NFA firearm, also a curio or relic

Official wording

ATF P 5300.11 · APRIL 2025 EDITION · SECTION IV · VERBATIM · PDF P. 85 ↗

Japanese, Type 10, cal. 50 mm Grenade Discharger (Knee Mortar) and variations thereof.

What this entry requires

  • INFOATF states no date; production was about 1921–1937.
  • INFOStill an NFA firearm; only registered examples transfer, with ATF approval (26 U.S.C. 5812, 5861).

Editorial facts · Our research

Country
Japan
Manufacturer
Not stated (Japanese manufacture)
Type
Other
Action
Other¹
Caliber
50mm
Made
1921–1937production; ATF states no date²
Service
Military
Search listings ↗Check a specific gunReport an error ↗

Source

Official wording
ATF P 5300.11, April 2025 edition · Section IV · PDF p. 85 ↗ · ATF original ↗
Entries
1 line
Verbatim check
Checked against the PDF text before every release
Editorial facts
Confidence: High · Last revised 18 October 2026 (Evidence pass) · How we rate confidence
References
  1. Wikipedia, “Type 10 grenade discharger” ↗, action: a smoothbore, muzzle loaded weapon: Other
  2. Wikipedia, “Type 10 grenade discharger” ↗, years: infobox production date 1921–1937 (Ness); Japanese Wikipedia 十年式擲弾筒: provisionally adopted 1921, production 1925–1937 (about 7,000); sources differ, y covers both
Fact tags
  • ATF the ATF wording states it.
  • REF ¹ an outside reference supports it; the number points to the list of references.
  • ESTIMATE an approximate or indirect reading, for example the production range of the base model.
  • NO CITATION we haven’t attached a reference for this fact; it’s our editorial reading, not ATF’s.
Source checked
20 October 2026: ATF’s page still lists the April 2025 edition
Corrections
2 changes · see below

Correction history

  1. Evidence passYears: 1921–1945 → 1921–1937. Wikipedia (en, ja): production ended 1937
  2. Evidence passMaker: Japanese Army arsenals → Not stated (Japanese manufacture)

All corrections · How corrections work

Historical context

Type 10 grenade discharger (knee mortar)

Image: Wikimedia Commons, “Japan Type 10 grenade discharger.jpg” by No machine-readable author provided. Makthorpe assumed (based on copyright claims)., CC BY-SA 2.5. Retrieved October 2026.

Summary: Wikipedia, “Type 10 grenade discharger”. Text CC BY-SA 4.0.

FROM WIKIPEDIA

The Type 10 grenade discharger was a Japanese smoothbore, muzzle loaded weapon used during the Second World War. It was copied and used by the Chinese under the designation Type 27 grenade launcher.