The Blastphemy kit includes one (1) Blastphemy and one (1) Flash Hider-QD 762 5/8×24. – The blast deflector directs the blast forward shielding the shooter and bystanders from overpressure and micro-concussions. It also functions as a thread protector for your muzzle device making it perfect for shooting from cover or in the prone position. – *The Blastphemy is NOT compatible with the Bannar or Comp-STS muzzle devices.