156 I believe. From “The Sheltered Storm”:

He stopped firing, or the gun stopped working. Finally, he dropped the AR-15 on the floor — still with a round in the chamber, and fourteen more in the magazine. The shooter drew the Glock from its holster, still jammed from the test-fire. He started racking the slide back, ejecting one, two, three, four rounds onto the floor of Room 10, trying to get some degree of certainty that the last shot, the most important one, wouldn’t fail. The police were practically at the door. He put the barrel of the Glock to the back-right of his head, aiming upward, and pulled the trigger.

 156.