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We still don't know which model you have, but the gritty sound is probably the stop lug rubbing on the recoil spring.
That means that you put the slide on without the spring being held captive.
If you have the gun with the little round button on top of the slide, you will have to turn the slide upside down and push the spring guide forward with a small screwdriver until you can push down (or up) on the button and capture it. Then you can install the slide, pull it back and press the button to unlock it and allow the slide to function.
If you have the type with the rectangular button on the back, hold the dismount lever down, install the slide, then push in on the button and let go of the dismount lever. It should go back up. If it doesn't push the button harder.
Jim
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