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 · III · 157

U.S. Small Arms Co. “Defender” knife-pistol

Section III: removed from the NFA, curio or relic under the GCA

Official wording

ATF P 5300.11 · APRIL 2025 EDITION · SECTION III · VERBATIM · PDF P. 45 ↗

U.S. Small Arms Company Knife-Pistols bearing “PATENT APL”D FOR” on the large blade and “DEFENDER” on the small blade as their only markings, cal. 22 rimfire.

What this entry requires

  • ATF REQUIRESYour firearm carries the marking “bearing “PATENT APL”D FOR” on the large blade and “DEFENDER” on the small blade as their only markings”
  • INFOATF states no date; production was about 1918–1930.

Editorial facts · Our research

Country
United States
Manufacturer
U.S. Small Arms Co., Chicago¹
Type
Other
Action
Other
Caliber
.22 rimfire
Made
c. 1918–1930production; ATF states no date²
Service
Commercial
Search listings ↗Check a specific gunReport an error ↗

Source

Official wording
ATF P 5300.11, April 2025 edition · Section III · PDF p. 45 ↗ · ATF original ↗
Entries
1 line
Verbatim check
Checked against the PDF text before every release
Editorial facts
Confidence: Medium · Last revised 18 October 2026 (Evidence pass) · How we rate confidence
References
  1. shootingillustrated.com ↗, maker: U.S. Small Arms Company, Inc. of Chicago began selling the Huntsman knife-pistol in 1917
  2. shootingillustrated.com ↗, years (estimate: range of the base model)
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. Data-trust reviewEditorial confidence: Low → Medium. Re-rated after supporting references were added or re-checked.
  2. Data-trust reviewMaker: U.S. Small Arms Co. → U.S. Small Arms Co., Chicago. Added Chicago

All corrections · How corrections work

Historical context

NO VERIFIED IMAGE AVAILABLEWe show only freely licensed images verified to depict this model. None has been found yet.