That is not the core issue though. The core issue is Feinstein's crazy overbroad defintion of  anything that may increase fire rate. Common and legal trigger modifications, including on basic handguns to take say a 10lb pull down to 8lbs which is very common for arthritis sufferers would be made illegal. Moving a mag release from right hand to left for a left hander increases firing rate. Reducing trigger pull length, a very common modification done for women with smaller hands -- including female federal law enforcement agents -- also increases firing rare from factory state. that would be illigal under Feinsteins proposal. The NRA is supporting something specific to bump stocks, Feinstein is seeking to create laws that would be 90% not about bump stocks