I have a little different issue with my Shield 9mm. My slide works perfectly unloaded but as soon as I rack the slide to put one in the chamber, it stops about 1/8 - 1/4 inch short of seating fully. It doesn't happen if I release it from the extreme back or if I use the slide stop and a release. Any amount of resistance or shortening of distance for the slide to travel forward causes it to stop short. Any ideas why this may be happening? Really don't want to send it back to S&W if it's not necessary.