unfortunately it is not working for my son's glock17. he was disappointed on the airsoft field yesterday even after ordering the correct m4 mag adapter that is not working to push the BBs up into the chamber from the mag adapter even at the correct PSI you can get one round and then it won't push it into the chamber in the correct location in order to fire more than one round since the mag adapter is not working. I would skip this kit and just kit just get the kit that comes with the pistor if I had it to do over again. hopefully they will allow us to return the kit so that we can order the HPA pistol and HPA kit all in one