RT-20
RT-20 is a sniper rifle or weapon model.
In detail
It is associated with Croatia.
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
“RT-20 (rifle)”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q1188825: RT-20
Consult the source