What is {diameter} of {5.56×45mm NATO} that is {applies to part} is {base} ?
5.56*45mm NATO is what at the base?
what diameter is 5.56*45mm NATO in the base?
SELECT ?h WHERE { resource:5.56×45mm_NATO property:diameter ?x . ?x property:applies_to_part resource:base . ?x property:diameter ?h }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q238456> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2386> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P518> <http://wikidata.dbpedia.org/resource/Q29841371>
} 

SELECT ?obj WHERE { wd:Q238456 p:P2386 ?s . ?s ps:P2386 ?obj . ?s pq:P518 wd:Q29841371 }