Hello all, I recently put together an ar 15 pistol (registered pistol reciever + 7.5 upper) when I took it out to test things out I encountered problems. I cannot get past 2 rounds, I have tried different (synthetic, steel, and aluminium) mags, both partial and fully loaded. 10 out of 10 trys yeilded one empty casing above the bolt and one fresh round pointing above the chamber and not going into battery.
This occurs every time without failure. Any insite on this situation would be appreciated. Thank you in advanced.