Ya these things are more than bleach, fertilizer and other household chemicals cobbled together.
From the New York Times:
“The arsenal’s medium-range rockets, based on Iranian and Russian design, can reach targets up to 25 miles, making Israeli targets as far as the Tel Aviv suburbs vulnerable. Versions of these weapons are believed to be produced inside Gaza.
The longest-range rockets can travel much farther and can hit Tel Aviv, Jerusalem and Ben-Gurion Airport. They include the M-75, a locally made rocket with technology supplied by Iran, and the J-80, a locally made rocket named after a famous Hamas military commander, Ahmed al-Jabari, killed by an Israeli airstrike in 2012. The numbers refer to their estimated ranges in kilometers.
On Thursday, Hamas claimed in a statement that it has a missile with a range of 250 kilometers, about 155 miles, that can hit anywhere in Israel.”
And Hamas is expanding its use of drone technology:
https://www.jpost.com/middle-east/ir...nalysis-668110