I just purchased an arex alpha and I was not happy today I shot 7 mags through it today with blazer brass 115g ammo and I had a failure to feed on a spent casing on every magazine could you maybe give me some advice on what's going on is it the gun having a manufacture malfunction or is it the cheap quality of beazer brass and low end 115g ammo? Love the way it shoots but cannot have it jamming on me