Modern warfare is about creeping up on your target unseen. To be invincible, it's good to be invisible. As a former Navy SEAL, host Richard Machowicz knows all about the dark and secretive world of stealth technology. Mack scores a world exclusive when he goes head to head with the notorious Predator, the silent aerial assassin. Then, Mack's on more familiar ground when he handles the formidable Barrett M107 rifle, loaded with new military-grade munitions that out-snipe the sniper — from nearly 2 miles away.