It appears that it is not an ammo issue. I have tried different brands. There are clear strike marks on the casings, but they are lite strikes. They are not as deep as the ones that go bang. What happens is that I pull the trigger and nothing happens. They all go bang on the second strike. This is now happening 1-2 times in each 10 round magazine. I have cleaned the gun and the symptoms persist. Is there a special place or way to clean it or is something bad inside the trigger and firing mechanism? I had to send the pistol back once already for failure to feed issues. They seem to have resolved that. Now the damn thing needs second strikes. Any ideas? Thanks.