It is kinda unusual; especially since this was approved by the ruling coalition (ANO2011 + CSSD) as well as the opposition, and tensions have been high, especially now due to Covid and the government's absolutely retarded handling of the situation.

This amendment is really popular among the people, the overwhelming majority are for it. We've had much more permissive laws regarding weapons than most other European countries for decades and we're one of the safest countries in the world; people notice. It's also election year, the elections are in October, so not many politicians want to publicly come out against this.

KDU-ČSL are the Christian Democrats (KDU = Křesťanská demokratická unie = Christian democratic union), also known as literal political prostitutes. They were one of the very few parties that existed even during communism to put up an illusion of plurality, and they were allowed to exist because the Communists knew they could depend on them to do whatever they were told. That never changed. Once in a while someone in the party grows a spine and does something good (like this dude, check out the 3rd paragraph), but that never lasts and that person usually either leaves or gets kicked out.