Underwood 817 9mm +P+ 90gr Extreme Defender Ammo - 20 Rounds

The Underwood Ammo 817 9mm +P+ delivers maximum stopping power through its lightweight 90-grain Extreme Defender projectile design. This high-pressure loading generates velocities exceeding 1,400 fps from standard barrel lengths, creating devastating terminal performance in a compact package. Law enforcement and civilian defenders rely on this ammunition for situations demanding immediate threat neutralization.

What Makes This Different

Unlike traditional hollow point designs, the Extreme Defender projectile features a unique fluted nose that creates multiple wound channels while maintaining deep penetration. The 90-grain weight reduces felt recoil compared to heavier +P+ loads while delivering superior energy transfer. Standard pressure 9mm ammunition typically produces 300-350 ft-lbs of energy, while this +P+ loading generates over 400 ft-lbs at the muzzle.

Key Features

• 90-grain Extreme Defender projectile with fluted nose design
• +P+ pressure loading for maximum velocity and energy
• Nickel-plated brass cases for reliable extraction and corrosion resistance
• Muzzle velocity of 1,475+ fps from 4-inch barrel
• Consistent powder charges for shot-to-shot reliability
• 20 rounds per box, 10 boxes per case (200 total rounds)
• Compatible with all 9mm Luger chambered firearms

This ammunition excels in defensive scenarios where overpenetration concerns limit hollow point effectiveness. The solid copper construction eliminates expansion variables while the fluted design creates tissue disruption comparable to expanded projectiles. Testing demonstrates consistent performance through heavy clothing, drywall, and automotive glass. The reduced bullet weight allows faster follow-up shots while maintaining sufficient penetration depth for threat neutralization.

Technical Specs

• Caliber: 9mm Luger (+P+ pressure)
• Bullet Weight: 90 grains
• Bullet Type: Extreme Defender solid copper
• Muzzle Velocity: 1,475 fps (4-inch barrel)
• Muzzle Energy: 435 ft-lbs
• Case Material: Nickel-plated brass
• Primer: Small pistol
• Quantity: 20 rounds per box
• Manufactured: United States

Underwood's reputation for consistent quality control and precise powder charges makes this ammunition suitable for duty carry and personal protection. The +P+ designation requires firearms specifically rated for high-pressure loads, ensuring optimal performance without compromising safety margins.