CREATE TABLE table_204_343 (id NUMBER, "nation" CLOB, "model" CLOB, "length" CLOB, "barrel length" CLOB, "weight" CLOB)

which rifle has the longest barrel ?
SELECT "model" FROM table_204_343 ORDER BY "barrel length" DESC LIMIT 1
SELECT "model" FROM "table_204_343" ORDER BY "barrel length" DESC FETCH FIRST 1 ROWS ONLY