check that the spring guide is seated properlly where it should sit on the outer barrel, and that its not crooked, or sitting on a part it shouldn't. Did you sit on the slide or crush it while it was off as to cause it to be warped (assuming its metal KJW or WA/TM with metal slide). Are the rails on the frame straight, unwarped? There is not alot to gas guns.. Just systematically check all the parts that relate directly to the motion of the slide (ie. not many).
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