What you pay for - Ghost Firearms Vital 5.56 Upper Receiver

Cheapest upper available online that I could find in months of searching. I ordered like oct 15, the last one in stock, on oct 25 I got tracking information and it was almost at my door. The barrel has a knurled piece that holds the rail and the rail simply clamps on, it was very tight and I scratched a lot of stuff trying to remove it. I can't remove the flash hider and I'm worried about putting my hand on it. I've tried almost everything.