Brenneke Special Forces Maximum Barrier Penetration Magnum. Our Special Forces Maximum Barrier Penetration Magnum is able to penetrate windshields rims tires and even engines. It incorporates an extra-hard alloy for maximum penetration as its name implies. It was specially developed to police and military specifications. Developed to police and military specifications our Special Forces Maximum Barrier Penetration Magnum is the ultimate cartridge for demanding urban environments. It incorporates an extra-hard alloy for maximum penetration as its name implies. This means devastating power with the ability to penetrate windshields wheel rims tires and even engines. There is simply no more effective projectile for stopping modern day threats that often come in vehicles and protected by other barriers. Specifications for Brenneke Special Forces Maximum Barrier Penetration Magnum: Manufacturer: Brenneke Gauge: 12 Number of Rounds: 5 Shell Length: 2 3/4 in Muzzle Velocity: 1650 ft/s Application: Personal Defense Self-Defense Included Accessories: None Shot Material: Lead Primer Style: Centerfire Bullet Type: Slug Cartridge Case Material: Brass Lead Free: No Muzzle Energy: 3545 ft-lbs Shot Size: Slug Shotgun Shot Weight: 1 3/8 oz Features of Brenneke Special Forces Maximum Barrier Penetration Magnum Lead point with ribs that point to the right ensure smooth choke passage Patented rear slides into point after the impact Package Contents: Brenneke Special Forces Maximum Barrier Penetration Magnum What is Brenneke Special Forces Maximum Barrier Penetration Magnum good for? The manufacturer suggests that it is best for self-defense personal defense.