I checked my clean and dry XDS 4.0 9mm, and it did the same thing as yours; the slide stayed back. I then oiled the gun, and it would only stay back if the muzzle was pointed upward. If I lowered the gun to the horizontal position, the slide went forward. The slide would not stay back if the muzzle was horizontal or pointed downward. I think all it needs is a heavier spring, but Springfield should supply it because the gun should have been supplied with the proper weight spring.
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