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 · 020

FNAB-43, S/N 5391

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. 82 ↗

Brevettata, Model F.N.A.-B 1943, submachinegun, cal. 9mm Parabellum, with an 8" barrel, S/N 5391.

“Brevettata” (Italian for “patented”) is a marking, not the maker.

What this entry requires

  • ATF REQUIRESConfigured as the ATF wording states: “with an 8" barrel”
  • ATF REQUIRESYour serial number is one ATF listsATF: “S/N 5391”
  • INFOATF states no date; production was about 1943–1945.
  • INFOStill an NFA firearm; only registered examples transfer, with ATF approval (26 U.S.C. 5812, 5861).

Editorial facts · Our research

Country
Italy
Manufacturer
Fabbrica Nazionale d’Armi, Brescia
Type
SMG
Action
Select-fire / auto
Caliber
9mm Parabellum
Made
S/N 5391 only · c. 1943–1945production; ATF states no date¹
Service
Military
Search listings ↗Check a specific gunReport an error ↗

Source

Official wording
ATF P 5300.11, April 2025 edition · Section IV · PDF p. 82 ↗ · 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. Wikipedia, “FNAB-43” ↗, years: infobox production date 1943–1945 (~1,000 made).
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
None

Historical context

FNAB-43, S/N 5391

Image: Wikimedia Commons, “Cuchillos, picas, armaduras y bayonetas - Museo de Armas de la Nación 55.JPG” by Gelpgim22 (Sergio Moises Panie Pitrau), CC BY-SA 4.0. Retrieved October 2026.

Summary: Wikipedia, “FNAB-43”. Text CC BY-SA 4.0.

FROM WIKIPEDIA

The FNAB-43 is an Italian designed and developed submachine gun manufactured from 1943 to 1945. The first prototype was built in 1942 and the ~1,000 built by the FNA-B according to Ian McCollum of Forgotten Weapons were issued to German and Italian RSI units fighting in Northern Italy. The FNAB-43 was an expensive weapon to manufacture as it used extensive milling and precision engineering in its manufacture.