The other day at the range my 45 shield jammed on the second shot. It buried the nose of the bullet into the ramp. To clear it all I had to do was pull the slide back slightly and release, the gun was then in battery. This happened again on the next magazine (same mag) 2 times in a row. Then operated flawlessly for the next 60 rounds. The gun and magazine were clean. The gun has had around 500 rounds through it previous to this day. Any suggestions would be appreciated.

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4516, shield 40, shield 45