Cleaned it right out of the box before going out to the range. Take down was very easy. Slide removed with no problems. Took it out to the range and put 80 rounds thru it. When I tried to remove slide for cleaning it did not want to slide out. I had to hit it several time with the palm of my hand to remove it. Even after cleaning and oiling the slide is very hard to remove. Is this a common problem ???? And is there anything I can do About it.