Doubletap Ammunition Defense 9mm Luger +P 124 Gr Jacketed Hollow Point. This round virtually has no muzzle flash and is an excellent defensive load with excellent penetration. Specifications for Doubletap Ammunition 9MM124BD Defense 9mm Luger +P 124 Gr Jacketed Hollow Point: Manufacturer: Doubletap Ammunition Caliber: 9mm Luger Number of Rounds: 20 Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 124 grain Cartridge Case Material: Brass Muzzle Velocity: 1300 ft/s Application: Target Self-Defense Primer Style: Centerfire