Regrettably, mass shootings of children now occur so frequently in United States schools that some parents are buying so-called bulletproof backpacks for their children. While the backpacks can stop a bullet fired from a handgun, they are ineffective against semi-automatic rifles, which ruthless shooters can easily purchase in that country.
Source: tatoeba (8125270)
The pro-gun majority in the House of Representatives moved Wednesday to compel the nation's capital to broaden the rights of its residents to buy and own firearms, including semi-automatic weapons.
Source: wiktionary
The Los Angeles ordinance covers semi-automatics with a detachable magazine of 20 rounds or more. As examples, it cited such weapons as the AR 15 assault rifles, Uzi assault rifles and carbines, Ingram Mac-10 and Mac-11 assault carbines, AK-47 assault rifles, Thompson carbines and all Avtomat Kalashnikov weapons.
Source: wiktionary