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 · 214

Kg m/21 automatic rifle

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. 88 ↗

Swedish, Model 21, cal. 6.5mm, automatic rifles mfd. prior to 1946.

ATF lists cal. 6.5mm; this is the 6.5×55mm Swedish cartridge.

What this entry requires

  • ATF REQUIRESMade 1945 or earlier (ATF’s dates)ATF: “mfd. prior to 1946”
  • INFOStill an NFA firearm; only registered examples transfer, with ATF approval (26 U.S.C. 5812, 5861).

Editorial facts · Our research

Country
SwedenBasis: the ATF wording
Manufacturer
Colt; Carl Gustafs stads gevärsfaktoriBasis: outside reference ¹
Type
MachinegunBasis: the ATF wording
Action
Select-fire / autoBasis: the ATF wording
Caliber
6.5×55mmBasis: the ATF wording
Made
Before 1946Basis: estimate ²
Service
Military

Source

Official wording
ATF P 5300.11, April 2025 edition · Section IV · PDF p. 88 ↗ · 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. 1. Wikipedia, “M1918 Browning automatic rifle” ↗, maker
  2. 2. Wikipedia, “Browning Automatic Rifle” ↗, years (estimate: partly supports it): a Swedish committee was set up in 1921 and 403 BARs bought from the USA, later licence-made as kg m/21 (en: FN imported Colt guns 1921–1928); the end is ATF's own limit (prior to 1946)
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
1 change · see below

Correction history

  1. Evidence passMaker: Carl Gustafs stads gevärsfaktori → Colt; Carl Gustafs stads gevärsfaktori. The BAR article and the marked Armémuseum example show the first m/21s were Colt-made

All corrections · How corrections work

Historical context

Kg m/21 automatic rifle

Image: Wikimedia Commons, “Swedish Kg M1921 Right.jpg” by Armémuseum (The Swedish Army Museum), Public domain. Retrieved October 2026.

Summary: Wikipedia, “M1918 Browning automatic rifle”. Text CC BY-SA 4.0.

FROM WIKIPEDIA

The Browning automatic rifle (BAR) is a family of American automatic rifle used by the United States and numerous other countries during the 20th century. The primary variant of the BAR series was the M1918, chambered for the .30-06 Springfield rifle cartridge and designed by John Browning in 1917 for the American Expeditionary Forces in Europe as a replacement for the French-made Chauchat and M1909 Benét–Mercié machine guns that U.S. forces had previously been issued.