u/Kirchbergphotography

Hi, I recently bought an AAP01. However im having issues, the pistol runs perfectly without ammo, but when i do run a mag with ammo the pistol jams, the bolt doesnt return fully and gets stuck 70% of the way. Its not a problem with the upper, this works smooth as butter when taken off. I can simulate it getting stuck by bringing it forward very slowly after racking it.
Sometimes i can half press the trigger when the bolt is almost closed, and that will release it and get almost the rest of the way to fully returned, this only works without ammo, anyone have any ideas how i could fix this?