I got my Knockout signed by Rob O'Neill, the author of "The Operator: Firing the Shots that Killed Osama Bin Laden and My Years as a SEAL Team Warrior" : r/Nerf
Nerf blaster NG-1: High power fly wheel ; semi-auto; large 380 high speed motors
NERF B4618EU6 Modulus Ionfire Blaster by Nerf - Shop Online for Toys in the United States