It won’t fire - Radical Firearms AR-15 RF Upper Assembly 16in 7.62x39 w/ A2 Flash Hider

I purchased this excited because I couldn’t wait to actually get an a K version of an AR or more or less an AR 47. I put it on my radical firearms lower, took it to the range. Inserted the magazine pulled back on the charging handle which loaded the bullet into the chamber went to fire it nothing happened. I then tried another bolt carrier, which was my Franklin in arms he did exact same thing, so that I pulled my boat carrier out of my 556 AR that I just got done firing once again nothing happened I have asked for help and nobody will respond