Solothurn S-18/100
Solothurn S-18/100 is an anti-materiel rifle or anti-tank rifle.
In detail
It is associated with Switzerland.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Solothurn S-18/100”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q1062499: Solothurn S-18/100
Consult the source