New grendel, wont fire

[Deezil]

I didnt buy it brand new from AA, (they were months out of stock), I bought it from a dealer that claims they assembled it and shot it a few times to make sure it worked... Playing with it here, I take a round and put it in by hand and push it in as far as I can with my fingers and put a cleaning rod in the muzzle and put a mark on it when it touches the head of the bullet, then load one with the bolt, and it stops in the same spot. The ammo just isnt going into the barrel far enough I think.. How the heck do I fix that?