This is the 13375th most frequent Russian word.
навылет
"Навылет" means "right through" or "through and through."
Here, 'навылет' is used metaphorically to denote complete conviction or thorough extent of the state described.
Он уверен в своей правоте навылет.
He is completely certain about his correctness.
In this sentence, 'навылет' describes the bullet passing entirely through an object.
Пуля прошла его тело навылет.
The bullet passed through his body completely.
In this context, 'навылет' illustrates the action of the arrow going all the way through the shield.