The bolt won't spring forward unless you have a pump return spring on the pump arm installed. You won't need to tear it apart to see that. Phantoms aren't too hard on paint if you have them setup for it. If you're running the open face tpc then you will want to have the air regulated to run brittle paint. The ported one tends to be better for unregulated co2. Be sure to be quick when cocking the gun. If you're not running an aspiring body or one with a detent you can get double feeding if you pump slowly.