SEARA ROBUSTA: Improved pump skewer sear

This is a remix of the sear from SillyButt's pump action skewer foam dart blaster. I was having issues with the sear not catching higher power springs well so I increased the width of the part of the sear that interacts with the plunger by 2mm. So far, this seems to have increased the robustness of the sear and eliminated failure-to-catch misfires without much change to trigger feel.

Please note that these results are based so far on at-home tests and 1 game using a K25 spring. Your mileage may vary.