I just picked up a BX trigger, and Ruger seems to be doubling down on messing with the bolt tab. The pivot hole is now elongated, so that has to be filled (welded) to a proper pin diameter. Instructions from Ruger say to push rearward on the tab to lock the bolt back, push upward on the tab to release it (filling in the hole elongation eliminates the need for the upward action). While I'm fixing the hole, I'll be adding a bit more metal so the tab will stick out beyond the mag quick-release I installed.