Underwood Ammo152744344
Underwood Ammo Ua 817 9Mm +P+ 90Gr Xtreme Defender 20/10$26.06
Availability: In Stock
The Underwood Ammo 9mm +P 90gr Xtreme Defender is a modern, purpose-built self-defense round engineered for shooters who want a reliable, hard-hitting option in a compact, lightweight package. Built on nickel-plated brass cases with non-corrosive boxer primers, this ammunition delivers 1475 feet per second and 435 ft-lbs of muzzle energy—velocities and power that put this round in the supersonic realm, ensuring consistent performance across a wide range of 9mm platforms. The 90-grain Xtreme Defender bullet is lead-free, all-copper construction, designed to provide the penetration and expansion characteristics serious defensive shooters expect.
This is ammunition built for real-world carry and personal protection. The copper-core bullet design and sectional density of 0.102 offer a balance of velocity and mass retention that translates to reliable performance on target. Whether you're looking for a duty round, a carry load, or ammunition for defensive pistol training, the Xtreme Defender's speed and energy make it a solid choice. The ballistic coefficient of 0.087 (G1) keeps the projectile stable in flight, which matters when precision and consistency are non-negotiable.
Reloadable brass cases mean you can reload these cartridges after firing, which appeals to shooters looking to get more life from their spent casings. And if you run a suppressed 9mm, you're in luck—this round is confirmed safe for suppressor use, giving you flexibility whether you're shooting unsuppressed or with a can attached.
Each box contains 20 loaded rounds, making the 20/10 pack configuration easy to stock and manage. Underwood's reputation for quality control and consistent powder charges means you can trust these loads to perform the same way, shot after shot.
| Caliber | 9mm Luger +P |
| Bullet Weight | 90 grains |
| Bullet Material | Copper |
| Bullet Diameter | 0.355" |
| Muzzle Velocity | 1475 fps |
| Muzzle Energy | 435 ft-lbs |
| Ballistic Coefficient (G1) | 0.087 |
| Sectional Density | 0.102 |
| Case Type | Nickel-Plated Brass |
| Primer Type | Boxer, Non-Corrosive |
| Reloadable | Yes |
| Lead Content | Lead-Free |
| Rounds Per Box | 20 |
| Manufacturer | Underwood Ammo |
The Xtreme Defender is loaded to +P pressure levels. While many modern 9mm firearms are rated for +P ammunition, always consult your firearm's manual or manufacturer to confirm your specific model is approved for +P loads. Using +P ammunition in firearms not rated for it can cause damage and safety issues.
Yes. The Underwood 9mm +P 90gr Xtreme Defender is confirmed safe for use in suppressed firearms, giving you flexibility whether you're shooting with or without a can.
Yes. These rounds use non-corrosive boxer-primed brass cases that are reloadable, so you can reload and reuse the casings after firing.
The Xtreme Defender is engineered as a self-defense and duty round. The all-copper, lead-free bullet design and supersonic velocity are intended to deliver reliable expansion and penetration for personal protection applications.
SKU: 152744360 • Width: 2.3in • Height: 1.3in • Depth: 2.6in • Weight: 0.495oz
Availability: In Stock
The Underwood Ammo 9mm +P 90gr Xtreme Defender is a modern, purpose-built self-defense round engineered for shooters who want a reliable, hard-hitting option in a compact, lightweight package. Built on nickel-plated brass cases with non-corrosive boxer primers, this ammunition delivers 1475 feet per second and 435 ft-lbs of muzzle energy—velocities and power that put this round in the supersonic realm, ensuring consistent performance across a wide range of 9mm platforms. The 90-grain Xtreme Defender bullet is lead-free, all-copper construction, designed to provide the penetration and expansion characteristics serious defensive shooters expect.
This is ammunition built for real-world carry and personal protection. The copper-core bullet design and sectional density of 0.102 offer a balance of velocity and mass retention that translates to reliable performance on target. Whether you're looking for a duty round, a carry load, or ammunition for defensive pistol training, the Xtreme Defender's speed and energy make it a solid choice. The ballistic coefficient of 0.087 (G1) keeps the projectile stable in flight, which matters when precision and consistency are non-negotiable.
Reloadable brass cases mean you can reload these cartridges after firing, which appeals to shooters looking to get more life from their spent casings. And if you run a suppressed 9mm, you're in luck—this round is confirmed safe for suppressor use, giving you flexibility whether you're shooting unsuppressed or with a can attached.
Each box contains 20 loaded rounds, making the 20/10 pack configuration easy to stock and manage. Underwood's reputation for quality control and consistent powder charges means you can trust these loads to perform the same way, shot after shot.
| Caliber | 9mm Luger +P |
| Bullet Weight | 90 grains |
| Bullet Material | Copper |
| Bullet Diameter | 0.355" |
| Muzzle Velocity | 1475 fps |
| Muzzle Energy | 435 ft-lbs |
| Ballistic Coefficient (G1) | 0.087 |
| Sectional Density | 0.102 |
| Case Type | Nickel-Plated Brass |
| Primer Type | Boxer, Non-Corrosive |
| Reloadable | Yes |
| Lead Content | Lead-Free |
| Rounds Per Box | 20 |
| Manufacturer | Underwood Ammo |
The Xtreme Defender is loaded to +P pressure levels. While many modern 9mm firearms are rated for +P ammunition, always consult your firearm's manual or manufacturer to confirm your specific model is approved for +P loads. Using +P ammunition in firearms not rated for it can cause damage and safety issues.
Yes. The Underwood 9mm +P 90gr Xtreme Defender is confirmed safe for use in suppressed firearms, giving you flexibility whether you're shooting with or without a can.
Yes. These rounds use non-corrosive boxer-primed brass cases that are reloadable, so you can reload and reuse the casings after firing.
The Xtreme Defender is engineered as a self-defense and duty round. The all-copper, lead-free bullet design and supersonic velocity are intended to deliver reliable expansion and penetration for personal protection applications.
SKU: 152744360 • Width: 2.3in • Height: 1.3in • Depth: 2.6in • Weight: 0.495oz