Enough Republican members showed up in the Oregon Senate to end a six-week walkout that halted the work of the Legislature and blocked hundreds of bills, including some on abortion, transgender health care and gun safety. The boycott, which prevented the Senate from reaching a two-thirds quorum needed to pass bills, was prompted by a sweeping measure on abortion and gender-affirming care that Republicans said was too extreme. The walkout also blocked the approval of the two-year state budget and a gun-safety measure opposed by the GOP that would increase the purchasing age to 21 for semiautomatic rifles.