Solothurn S18-100, S18-1000 & S18-1100
Official wording
Solothurn, Models S18-100, S18-1000 and S18-1100, cal. 20mm, semiautomatic, anti-tank rifles.
What this entry requires
- INFOATF states no date; production was about 1932–1943.
- INFOStill an NFA firearm; only registered examples transfer, with ATF approval (26 U.S.C. 5812, 5861).
Editorial facts · Our research
- Country
SwitzerlandBasis: no citation - Manufacturer
- Waffenfabrik Solothurn AGBasis: the ATF wording
- Type
- RifleBasis: the ATF wording
- Action
- Semi-autoBasis: the ATF wording
- Caliber
- 20mmBasis: the ATF wording
- Made
- c. 1932–1943production; ATF states no dateBasis: outside reference ¹
- Service
- Military
Source
- Official wording
- ATF P 5300.11, April 2025 edition · Section IV · PDF p. 87 ↗ · 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, “Solothurn S-18/100” ↗, years: infobox production date 1934–1943 (variants S-18/1000, S-18/1100); German Wikipedia infobox Produktionsstart 1932; en S-18/1100 infobox 1942–early 1943 — sources disagree on the start, y widened to 1932–1943
- 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
- Evidence passYears: 1934–1945 → 1932–1943. English Wikipedia gives production 1934–1943, de gives a 1932 start; widened to cover both; no source gives 1945
Historical context
Image: Wikimedia Commons, “Bundesarchiv Bild 101I-189-1250-10, Russland-Süd, Soldat mit Panzerbüchse.jpg” by Schlegel, CC BY-SA 3.0 de. Retrieved October 2026.
Summary: Wikipedia, “Solothurn S-18/100”. Text CC BY-SA 4.0.
FROM WIKIPEDIA
The Solothurn S-18/100 20 mm anti-tank cannon was a German and Swiss anti-tank rifle used during the Second World War. It had a semi-automatic action in a bullpup configuration. As a result of its large, powerful ammunition, the gun had a tremendous recoil, and its size made portability difficult. The feed was either from a five or ten-round magazine that was attached horizontally to the left side of the gun. The gun used 20×105mm belted-case ammunition which it shared with the S 18-350 aircraft cannon that was developed from the rifle. A Finnish source gives armour penetration of the gun as 20mm at a 60-degree angle at 100-metre distance, decreasing to 16mm at 500 metres. A variant of this design, the Solothurn-Arsenal, was manufactured without license in Estonia before WW2; however only 20 were produced prior to Soviet occupation.