Fail to fire, hammer drops

[chadjetlag]

I built a 6.5 with a bolt from a group buy here and a double star barrel. If I load the rifle from a magazine, even using the forward assist, the hammer will drop and will not even put a mark on the primer. If I drop a round into the chamber it will fire and eject as advertised, the next round from the magazine will not fire. I assume it is not going fully into battery for some reason