HB 1240 will make it illegal to sell, transfer, distribute, manufacture or import a long list of prohibited firearms. The bill bans several broad categories such as the AK-47 and AR-15 "in all its forms," and then lists dozens of specific product lines, such as the Smith & Wesson M&P 15 and Bushmaster XM-15. 

It also bans the weapons by defining them as semiautomatic, centerfire rifles that accept a detachable magazine and also have at least one of many other listed features, such as a folding or telescoping stock. It also bars such weapons if they have an integral 10-round magazine. 

The bill was amended by the senate, so it now returns to Washington's House of Representatives for a final vote. The House passed the original bill on a 55-42 vote, and Governor Jay Inslee previously signaled his support, saying, "Passing an assault weapon ban will be a momentous step forward for Washington state." Tacoma-based firearm component-manufacturer Aero Precision begs to differ: