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Magtech First Defense 123-grain FMJ is built for anyone running .300 Blackout and looking for no-nonsense range ammunition that works. These rounds deliver consistent velocity and clean operation through both carbines and pistol platforms, making them ideal for breaking in a new rifle or running extended practice sessions without breaking the bank.
The 123-grain FMJ bullet is the sweet spot for supersonic .300 Blackout shooting. It hits harder than lighter loads while maintaining a flatter trajectory than heavier subsonic rounds, giving you predictable performance from 25 yards all the way out to 200+ yards depending on your setup. The full metal jacket design cycles reliably through AR-pattern firearms and minimizes fouling, which means less cleaning between range days. At 2230 feet per second, you get the ballistic consistency you need for zeroing optics or running accuracy drills without surprises.
If you're making the jump from 5.56 NATO, the appeal is straightforward. The .300 Blackout delivers .30-caliber performance from a simple barrel swap on your existing AR platform. You keep the bolt, magazines, and most components intact, but you gain access to heavier bullets and more terminal energy. The 123-grain Magtech load sits right in the practical middle ground where it works equally well in short-barrel rifles and longer carbines. It's versatile without making you buy multiple ammunition types to cover your shooting needs.
These rounds come in reloadable brass cases with standard Boxer primers, which matters if you're thinking about cost per round over time. Brass collectors know that Magtech cases are solid for reloading, and running your own loads down the road can extend the practical value of this initial investment. The non-corrosive, clean-burning powders mean minimal buildup inside your barrel, extending the life of your barrel between deep cleanings.
Yes. At 2230 feet per second, this load travels faster than the speed of sound (approximately 1100 fps). This means you'll hear both the gunshot report and the sonic crack when the bullet breaks the sound barrier, unlike heavier subsonic loads. It's designed for flat trajectory and velocity over distance, making it better suited for general range work and training than suppressed shooting.
Absolutely. The 123-grain FMJ cycles reliably through short-barrel rifles, full-length carbines, and .300 Blackout pistols. Magtech Blackout ammo is engineered for AR-pattern feeding, so whether you're running a 7-inch pistol or a 16-inch rifle, this load will function without issues. Just make sure your barrel is chambered in .300 Blackout and you're running a compatible bolt.
Yes, the brass cases are reloadable with standard small rifle primers and appropriate powders. Magtech brass is known for consistent dimensions and durability through multiple reloading cycles. If you hand-load, these cases represent good raw material for developing custom loads or simply reducing your per-round cost over time.
The 123-grain is a lighter, faster supersonic option compared to the popular 150 to 220-grain loads available in .300 Blackout. It shoots flatter and maintains energy better at distance, but carries less momentum than heavier bullets. For general range training and optics zeroing, the 123-grain FMJ is cost-effective and practical. Heavier loads are typically reserved for hunting or suppressed subsonic work.
| Bullet Weight (Grains) | 123 |
|---|---|
| Caliber/Gauge | .300 AAC Blackout |
| Case Material | Brass |
| Cost per Round | 0.82 |
| Grains | 123Gr |
| Length | 3.9000 |
| Manufacturer | |
| Manufacturer Part Number | 300BLKB |
| Model | |
| Product Type | Full Metal Jacket |
| Shipping Weight | 1.709 |
| Units per Box | 50 |
| UPC | 754908209613 |
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