Anyone else having a problem with the Extractor Pivot Pin (Part 6 on the exploded diagram), not staying in? With a low 3000 serial number I field stripped the SR9 after its first 200 rounds and the pin simply fell to the ground with the extractor popping out. Drove the pin back in and 95 rounds later it fell out again, ONCE the slide was removed. ....Called Ruger, eventually got a replacement pin and 100 rounds later it again is protruding from the recess in the bottom of the slide. Just wondering if this is only me?